Experts dismiss Mexico's account of apparent student massacre

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Missing 43 Students in Mexico 'All Kidnapped and Killed'

Mexico's official account of the abduction and apparent massacre of 43 students last year does not add up, a team of international experts said on Sunday, citing deep flaws in the government's investigation and dismissing its claims that the victims were incinerated in a garbage dump.

The case provoked a global outcry after the missing students were abducted in the city of Iguala in southwest Mexico on Sept. 26, 2014.

The government's failure to capture the killers or even persuade Mexicans that its investigation was serious has hit President Enrique Peña Nieto's reputation, and the report on Sunday was certain to pile more pressure on.

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Experts dismiss Mexico's account of apparent student massacre
Mexican army soldiers conduct an inspection of a passenger to a vehicle during a military search operation September 30, 2014 on the road between Iguala and Chilpancingo after last weekends clashes in Iguala, Guerrero state, Mexico. Fourteen of the 57 students reported missing after weekend shootings that killed six people in the southern state of Guerrero have been located, officials reported. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
MEXICO CITY, MEXICO - NOVEMBER 4: A view of the house where former mayor of Iguala Jose Luis Abarca was allegedly arrested on November 4, 2014 in Mexico City, Mexico. The fugitive mayor of Iguala and his wife who are wanted in the disappearance of 43 students from a southwestern teaching college, were arrested on November 4, 2014 in Mexico City. (Photo by Manuel Velasquez/Anadolu Agency/Getty Images)
MEXICO CITY, MEXICO - NOVEMBER 4: A view of the house where former mayor of Iguala Jose Luis Abarca was allegedly arrested on November 4, 2014 in Mexico City, Mexico. The fugitive mayor of Iguala and his wife who are wanted in the disappearance of 43 students from a southwestern teaching college, were arrested on November 4, 2014 in Mexico City. (Photo by Manuel Velasquez/Anadolu Agency/Getty Images)
A view of one of several homes that police raided in their search for fugitive mayor of Iguala Jose Luis Abarca and his wife Maria de los Angeles Pineda in the Iztapalapa neighborhood of Mexico City, Monday, Nov. 4, 2014. Federal police detained the couple where they were hiding out in a house. They are accused of ordering the Sept. 26 attacks on teachers' college students that left six dead and 43 still missing. (AP Photo/Eduardo Verdugo)
A view of one of several homes that police raided in their search for fugitive mayor of Iguala Jose Luis Abarca and his wife Maria de los Angeles Pineda in the Iztapalapa neighborhood of Mexico City, Monday, Nov. 4, 2014. Federal police detained the couple where they were hiding out in a house. They are accused of ordering the Sept. 26 attacks on teachers' college students that left six dead and 43 still missing. (AP Photo/Eduardo Verdugo)
A view through the front gate of one of several homes that police raided in their search for fugitive mayor of Iguala Jose Luis Abarca and his wife Maria de los Angeles Pineda in the Iztapalapa neighborhood of Mexico City, Monday, Nov. 4, 2014. Federal police detained the couple where they were hiding out in a house. They are accused of ordering the Sept. 26 attacks on teachers' college students that left six dead and 43 still missing. (AP Photo/Eduardo Verdugo)
A view of one of several homes that police raided in their search for fugitive mayor of Iguala Jose Luis Abarca and his wife Maria de los Angeles Pineda in the Iztapalapa neighborhood of Mexico City, Monday, Nov. 4, 2014. Federal police detained the couple where they were hiding out in a house. They are accused of ordering the Sept. 26 attacks on teachers' college students that left six dead and 43 still missing. (AP Photo/Eduardo Verdugo)
Authorities report that three suspects in the disappearance of 43 students in Mexico have described a macabre mass murder of the victims.
In this May 8, 2014 photo, Iguala city Mayor Jose Luis Abarca stands up during a meeting with state government officials in Chilpancingo, Mexico. Abarca is fugitive after the disappearance of 43 students during a Sept. 26 confrontation with local police that left six dead and more than 25 wounded. The local police chief is also fugitive and 22 officers have been arrested in connection with the killings. Officials are conducting DNA tests to determine if some of the disappeared students are among 28 charred bodies found in freshly covered mass graves near the town following the confrontation. (AP Photo/Alejandrino Gonzalez)
In this May 8, 2014 photo, the mayor of the city of Iguala, Jose Luis Abarca, right, and his wife Maria de los Angeles Pineda Villa meet with state government officials in Chilpancingo, Mexico. The mayor is fugitive and the whereabouts of his wife are unknown after the disappearance of 43 students during a Sept. 26 confrontation with local police that left six dead and more than 25 wounded. Maria de los Angeles Pineda Villa is from a family with known ties to the Beltran Leyva cartel. Prosecutors had identified her late brother Alberto as a main lieutenant in the cartel and he was arrested in 2009, along with her father and mother. (AP Photo/Alejandrino Gonzalez)
A sign promoting city projects featuring the city mayor and his wife, Jose Luis Abarca and Maria de los Angeles Pineda Villa, hangs outside the municipal headquarters in Iguala, Mexico, Tuesday, Oct. 7, 2014. The mayor is fugitive and the whereabouts of his wife are unknown after the disappearance of 43 students during a Sept. 26 confrontation with local police that left six dead and more than 25 wounded. Maria de los Angeles Pineda Villa is from a family with known ties to the Beltran Leyva cartel. Prosecutors had identified her late brother Alberto as a main lieutenant in the cartel and he was arrested in 2009, along with her father and mother. (AP Photo/Eduardo Verdugo)
A policeman stands guard at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Policemen stand guard at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Policemen stand guard at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A policeman stands guard at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Police check a minibus at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Policemen and forensic personnel arrive at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Policemen and forensic personnel holding white bags for corpses arrive at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Policemen and forensic personnel holding white bags for corpses arrive at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines patrol at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 4, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines guard the site where an unspecified number of bodies was found in clandestine graves in the outskirts of Iguala, Guerrero state, Mexico on October 4,2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/JESUS GUERRERO (Photo credit should read JESUS GUERRERO/AFP/Getty Images)
Mexican marines guard the site where an unspecified number of bodies was found in clandestine graves in the outskirts of Iguala, Guerrero state, Mexico on October 4,2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/JESUS GUERRERO (Photo credit should read JESUS GUERRERO/AFP/Getty Images)
A Mexican marine and policemen guard the site where an unspecified number of bodies was found in clandestine graves in the outskirts of Iguala, Guerrero state, Mexico on October 4,2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/JESUS GUERRERO (Photo credit should read JESUS GUERRERO/AFP/Getty Images)
A Mexican marine and a policeman guard the site where an unspecified number of bodies was found in clandestine graves in the outskirts of Iguala, Guerrero state, Mexico on October 4,2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. AFP PHOTO/JESUS GUERRERO (Photo credit should read JESUS GUERRERO/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A Mexican marine during in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Relatives of young missing meet with state policemen before a joint operation with navy, army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A resident (L) receives information released by a joint patrol of marines, army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Residents receive information released by a joint patrol of marines, army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Residents receive information released by a joint patrol of marines, army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Residents watch information released by a joint patrol of marines, army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Local residents watch as Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
State policemen are deployed to participate in a joint patrol with marines, army soldiers, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A Mexican marine speaks with children during a joint patrol with army, ministerial policemen and relatives of young went that missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican marines participate in a joint patrol with army, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
State policemen are deployed to participate in a joint patrol with marines, army soldiers, ministerial policemen and relatives of young that went missing during the last weekend clashes in Iguala, Guerrero state, Mexico on October 1, 2014. The fate of 43 missing Mexican students remains a mystery days after they vanished amid a police shooting: A survivor saw dozens bundled into patrol cars but authorities say they may be hiding. The teachers-in-training disappeared after a weekend of violence that left six people dead and 25 wounded in Iguala, a town surrounded by thick forests in the crime-plagued southern state of Guerrero. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A policeman stands guard outside the hospital September 30, 2014 where victims of last weekend's clashes are recovering in Iguala, Guerrero state, Mexico. Fourteen of 57 students who vanished after deadly shootings in southern Mexico have turned up alive but relatives feared for those still missing as authorities search for them. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A man prays before an altar near to a state policeman who stands guard at the hospital where victims of last weekend's clashes are recovering in Iguala, Guerrero state, Mexico. Fourteen of 57 students who vanished after deadly shootings in southern Mexico have turned up alive but relatives feared for those still missing as authorities search for them. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A teacher who did not want to be identified lies in a hospital bed September 30, 2014 recovering from two bullet wounds suffered during the last weekends clashes with alleged state police in Iguala, Guerrero state, Mexico. Fourteen of 57 students who vanished after deadly shootings in southern Mexico have turned up alive but relatives feared for those still missing as authorities search for them. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A teacher who did not want to be identified lies in a hospital bed September 30, 2014 recovering from two bullet wounds suffered during the last weekends clashes with alleged state police in Iguala, Guerrero state, Mexico. Fourteen of 57 students who vanished after deadly shootings in southern Mexico have turned up alive but relatives feared for those still missing as authorities search for them. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican army soldiers conduct an inspection on a vehicle during a military search operation of over 40 students September 30, 2014 on the road between Iguala and Chilpancingo after last weekends clashes in Iguala, Guerrero state, Mexico. Fourteen of the 57 students reported missing after weekend shootings that killed six people in the southern state of Guerrero have been located, officials reported. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican army soldiers conduct an inspection to the passenger of a vehicle during a military search operation of over 40 students September 30, 2014 on the road between Iguala and Chilpancingo after last weekends clashes in Iguala, Guerrero state, Mexico. Fourteen of the 57 students reported missing after weekend shootings that killed six people in the southern state of Guerrero have been located, officials reported. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican army soldiers conduct an inspection on a vehicle during a military search operation of over 40 students September 30, 2014 on the road between Iguala and Chilpancingo after last weekends clashes in Iguala, Guerrero state, Mexico. Fourteen of the 57 students reported missing after weekend shootings that killed six people in the southern state of Guerrero have been located, officials reported. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican army soldiers conduct an inspection on a vehicle during a military search operation of over 40 students September 30, 2014 on the road between Iguala and Chilpancingo after last weekends clashes in Iguala, Guerrero state, Mexico. Fourteen of the 57 students reported missing after weekend shootings that killed six people in the southern state of Guerrero have been located, officials reported. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican army soldiers conduct an inspection on a vehicle during a military search operation of over 40 students September 30, 2014 on the road between Iguala and Chilpancingo after last weekends clashes in Iguala, Guerrero state, Mexico. Fourteen of the 57 students reported missing after weekend shootings that killed six people in the southern state of Guerrero have been located, officials reported. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Mexican army soldiers conduct an inspection on a vehicle during a military search operation of over 40 students September 30, 2014 on the road between Iguala and Chilpancingo after last weekends clashes in Iguala, Guerrero state, Mexico. Fourteen of the 57 students reported missing after weekend shootings that killed six people in the southern state of Guerrero have been located, officials reported. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students protest in demand of justice for the deaths of six people including students of Ayotzinapa and football players of the team 'Los Avispones' in Iguala, Guerrero state, Mexico, on September 29, 2014, following recent clashes that led to at least six deaths. Twenty two officers have been detained after the September 26 incident in the town of Iguala. Mexican prosecutors on Monday were investigating whether local police officers were involved in the disappearance of 57 students who vanished after deadly incidents in Guerrero state. AFP PHOTO/Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
Students protest in demand of justice for the deaths of six people including students of Ayotzinapa and football players of the team 'Los Avispones' in Iguala, Guerrero state, Mexico, on September 29, 2014, following recent clashes that led to at least six deaths. Twenty two officers have been detained after the September 26 incident in the town of Iguala. Mexican prosecutors on Monday were investigating whether local police officers were involved in the disappearance of 57 students who vanished after deadly incidents in Guerrero state. AFP PHOTO/Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
Students protest in demand of justice for the deaths of six people including students of Ayotzinapa and football players of the team 'Los Avispones' in Iguala, Guerrero state, Mexico, on September 29, 2014, following recent clashes that led to at least six deaths. Twenty two officers have been detained after the September 26 incident in the town of Iguala. Mexican prosecutors on Monday were investigating whether local police officers were involved in the disappearance of 57 students who vanished after deadly incidents in Guerrero state. AFP PHOTO/Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
An unidentified detained police officer (2-R) is escorted to testify in Acapulco, Guerrero state, Mexico on September 28, 2014, in regards to clashes with protestors that led to at least six deaths. Twenty two officers have been detained after the incident that took place on the night of September 26 in the town of Iguala, when a student protest turned to violence leaving two students and two football players dead. AFP PHOTO / Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
Forensic workers stand inside of the morgue in Iguala Mexico, Sunday Oct. 5, 2014. Mexican forensic experts recovered 28 charred bodies from a clandestine grave on the outskirts of this city where police engaged in a deadly clash with student protesters a week ago, Guerrero state's chief prosecutor said Sunday. Authorities said the corpses were too badly damaged for immediate identification and he could not say whether any of the dead could be some of the 43 college students reported missing after the confrontation with police. (AP Photo/Eduardo Verdugo)
A forensic workers stand inside of the morgue in Iguala Mexico, Sunday Oct. 5, 2014. Mexican forensic experts recovered 28 charred bodies from a clandestine grave on the outskirts of this city where police engaged in a deadly clash with student protesters a week ago, Guerrero state's chief prosecutor said Sunday. Authorities said the corpses were too badly damaged for immediate identification and he could not say whether any of the dead could be some of the 43 college students reported missing after the confrontation with police. (AP Photo/Eduardo Verdugo)
Forensic workers arrive at the morgue in Iguala Mexico, Sunday Oct. 5, 2014. Mexican forensic experts recovered 28 charred bodies from a clandestine grave on the outskirts of this city where police engaged in a deadly clash with student protesters a week ago, Guerrero state's chief prosecutor said Sunday. Authorities said the corpses were too badly damaged for immediate identification and he could not say whether any of the dead could be some of the 43 college students reported missing after the confrontation with police. (AP Photo/Eduardo Verdugo)
Masked police officers stand guard atop a vehicle oudside of the morgue in Iguala Mexico, Sunday Oct. 5, 2014. Relatives are demanding answers after security forces investigating the role of municipal police in clashes a week ago found a mass grave, raising fears the pits might hold the bodies of 43 students missing since last week in the violence that also resulted in six shooting deaths. (AP Photo/Eduardo Verdugo)
A Mexican marine guards the road that leads to the site where an alleged clandestine mass grave was found near the city of Iguala, Mexico, Saturday Oct. 4, 2014. Mexican officials said a clandestine grave holding an undetermined number of bodies was found outside a town where violence last weekend resulted in six deaths and the disappearance of 43 students. (AP Photo/Alejandrino Gonzalez)
A Mexican navy marine guards the road that leads to the site where an alleged clandestine mass grave was found near the city of Iguala, Mexico, Saturday Oct. 4, 2014. Mexican officials said a clandestine grave holding an undetermined number of bodies was found outside a town where violence last weekend resulted in six deaths and the disappearance of 43 students. (AP Photo/Alejandrino Gonzalez)
Map locates Iguala, Mexico, outside of which a mass grave of burned bodies outside was found; 1c x 2 inches; 46.5 mm x 50 mm;
Mexican marines guard the road that leads to the site where an alleged clandestine mass grave was found near the city of Iguala, Mexico, Saturday Oct. 4, 2014. Mexican officials said a clandestine grave holding an undetermined number of bodies was found outside a town where violence last weekend resulted in six deaths and the disappearance of 43 students. (AP Photo/Alejandrino Gonzalez)
Mexican marines arrive to the site where a mass grave was found in Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, on October 5, 2014. At least 21 bodies were pulled from a mass grave in southern Mexico and authorities checked Sunday if they were among a group of 43 students missing since a police shooting last week. AFP PHOTO/ Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
Mexican marines arrive to the site where a mass grave was found in Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, on October 5, 2014. At least 21 bodies were pulled from a mass grave in southern Mexico and authorities checked Sunday if they were among a group of 43 students missing since a police shooting last week. AFP PHOTO/ Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
A member of the civil protection remains in the site where a mass grave was found in Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, on October 5, 2014. At least 21 bodies were pulled from a mass grave in southern Mexico and authorities checked Sunday if they were among a group of 43 students missing since a police shooting last week. AFP PHOTO/ Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
A policeman stands guard at the site where a mass grave was found in Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, on October 5, 2014. At least 21 bodies were pulled from a mass grave in southern Mexico and authorities checked Sunday if they were among a group of 43 students missing since a police shooting last week. AFP PHOTO/ Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
Mexican police officers and members of the civil protection remain in the site where a mass grave was found in Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, on October 5, 2014. At least 21 bodies were pulled from a mass grave in southern Mexico and authorities checked Sunday if they were among a group of 43 students missing since a police shooting last week. AFP PHOTO/ Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
Mexican police officers and members of the civil protection remain in the site where a mass grave was found in Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, on October 5, 2014. At least 21 bodies were pulled from a mass grave in southern Mexico and authorities checked Sunday if they were among a group of 43 students missing since a police shooting last week. AFP PHOTO/ Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
A Mexican marine stands guard at Pueblo Viejo, in the outskirts of Iguala, Guerrero state, Mexico, where a mass grave was found on October 5, 2014. At least 21 bodies were pulled from a mass grave in southern Mexico and authorities checked Sunday if they were among a group of 43 students missing since a police shooting last week. AFP PHOTO/ Pedro PARDO (Photo credit should read Pedro PARDO/AFP/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and the relatives of missing students try to stop a military convoy to block the highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and the relatives of missing students block the highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and relatives of missing students destroy the security cameras of toll booth as they block a highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and relatives of missing students block a toll booth on a highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and relatives of missing students destroy the security cameras as they block highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and the relatives of missing students try to stop a military convoy to block the highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and the relatives of missing students try to stop a military convoy to block the highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and relatives of missing students destroy the security cameras as they block highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and the relatives of missing students try to stop a military convoy to block the highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 05: Students and the relatives of missing students try to stop a military convoy to block the highway on October 05, 2014 in Chilpancingo, Mexico. Protesters are demanding answers a day after security forces, investigating the role of municipal police in clashes a week ago, found a mass grave on the outskirts of the Mexican town of Iguala, where 43 students went missing after gunmen fired on a demonstration they were attending. (Photo by Miguel Tovar/LatinContent/Getty Images)
Students take part in a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A masked student takes part in a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students with their faces covered take part in a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A student with his face covered takes part in a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students push back a military truck with soldiers during a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students face Mexican soldiers during a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students show the pictures of 43 missing peers to Mexican soldiers during a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate their disappearance in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students show the pictures of 43 missing peers to Mexican soldiers during a road block on the highway between Acapulco and Mexico DF to demand the goverment of Guerrero state to investigate their disappearance in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A man shows the pictures of 43 students missing during a protest at the tollbooth on the highway between Acapulco and Mexico DF demanding the goverment of Guerrero state to investigate their disappearance in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A student with his face covered takes part in a protest at the tollbooth on the highway between Acapulco and Mexico DF demanding the goverment of Guerrero state to investigate the disappearance of peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students with their faces covered take control of the tollbooth on the highway between Acapulco and Mexico DF during a protest demanding the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students take control of the tollbooth on the highway between Acapulco and Mexico DF during a protest demanding the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students take control of the tollbooth on the highway between Acapulco and Mexico DF during a protest demanding the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students take control of the tollbooth on the highway between Acapulco and Mexico DF during a protest demanding the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
A student destroys cameras at a tollbooth along the highway between Acapulco and Mexico DF during a protest demanding the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Students take control of the tollbooth on the highway between Acapulco and Mexico DF during a protest demanding the goverment of Guerrero state to investigate the disappearance of their peers in Chilpancingo, Mexico on October 5, 2014. Authorities unearthed on Saturday unmarked graves containing a number of bodies on the outskirts of a southern Mexico town where 43 students disappeared after a deadly police shooting last week. Inaky Blanco, chief prosecutor for the violence-plagued state of Guerrero, said it was too early to say how many bodies were buried in the pits outside Iguala, 200 kilometers (125 miles) south of Mexico City. AFP PHOTO/ Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Relatives and mates of the 43 missing students take part in a mass at the Cathedral in Chilpancingo, Guerrero state on October 14, 2014. The parents demand the finding of the 43 students missing since an attack by rogue officers earlier this month. DNA results showed that 28 bodies found in a mass grave in southern Mexico are not those of the missing students, the country's attorney general said. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Relatives and mates of the 43 missing students take part in a mass at the Cathedral in Chilpancingo, Guerrero state on October 14, 2014. The parents demand the finding of the 43 students missing since an attack by rogue officers earlier this month. DNA results showed that 28 bodies found in a mass grave in southern Mexico are not those of the missing students, the country's attorney general said. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Relatives and mates of the 43 missing students take part in a mass at the Cathedral in Chilpancingo, Guerrero state on October 14, 2014. The parents demand the finding of the 43 students missing since an attack by rogue officers earlier this month. DNA results showed that 28 bodies found in a mass grave in southern Mexico are not those of the missing students, the country's attorney general said. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Relatives and mates of the 43 missing students take part in a mass at the Cathedral in Chilpancingo, Guerrero state on October 14, 2014. The parents demand the finding of the 43 students missing since an attack by rogue officers earlier this month. DNA results showed that 28 bodies found in a mass grave in southern Mexico are not those of the missing students, the country's attorney general said. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Relatives and mates of the 43 missing students take part in a mass at the Cathedral in Chilpancingo, Guerrero state on October 14, 2014. The parents demand the finding of the 43 students missing since an attack by rogue officers earlier this month. DNA results showed that 28 bodies found in a mass grave in southern Mexico are not those of the missing students, the country's attorney general said. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Parents, relatives and mates of the 43 missing students place flowers and light candles at the Cathedral during a mass in Chilpancingo, Guerrero state on October 14, 2014. The parents demand the finding of the 43 students missing since an attack by rogue officers earlier this month. DNA results showed that 28 bodies found in a mass grave in southern Mexico are not those of the missing students, the country's attorney general said. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Riot policemen gear at the state congress building in Chilpancingo, Guerrero state on October 14, 2014. Protesters pressure to demand the finding of the 43 mates missing since an attack by rogue officers earlier this month while authorities are yet investigating whether the students were buried in mass graves found outside Iguala, a city 200 kilometers (125 miles) south of Mexico City. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
IGUALA, MEXICO - OCTOBER 13: Federal police officers stand guard at a check point near the area where clandestine graves were found, in the outskirts of Iguala on October 13, 2014 in Iguala , Mexico. Mexican authorities found four more clandestine graves containing human remains near Iguala where 43 students went missing after a confrontation with local police that left 6 dead last september 26. (Photo by Miguel Tovar/LatinContent/Getty Images)
IGUALA, MEXICO - OCTOBER 13: Abandoned clothing is seen near a clandestine graves at La Joya, in the outskirts of Iguala on October 13, 2014 in Iguala , Mexico. Mexican authorities found four more clandestine graves containing human remains near Iguala where 43 students went missing after a confrontation with local police that left 6 dead last september 26. (Photo by Miguel Tovar/LatinContent/Getty Images)
IGUALA, MEXICO - OCTOBER 13: A federal police officer stands guard at a check point near the area where a clandestine graves were found, in the outskirts of Iguala on October 13, 2014 in Iguala , Mexico. Mexican authorities found four more clandestine graves containing human remains near Iguala where 43 students went missing after a confrontation with local police that left 6 dead last september 26. (Photo by Miguel Tovar/LatinContent/Getty Images)
TIXTLA, MEXICO - OCTOBER 13: Member of the community police force stand guard outside the Raul Isidro Burgos de Ayotzinapa Teachers College on October 13, 2014 in Tixtla , Mexico. The community police is securing the area around the school and is also helping relatives in the search for the 43 students that went missing after a confrontation with local police that left 6 dead last september 26. (Photo by Miguel Tovar/LatinContent/Getty Images)
TIXTLA, MEXICO - OCTOBER 13: Members of the community police force stand guard outside of the Raul Isidro Burgos de Ayotzinapa Teachers College on October 13, 2014 in Tixtla, Mexico. The community police is securing the area around the school and is also helping relatives in the search for the 43 students that went missing after a confrontation with local police that left 6 dead last september 26. (Photo by Miguel Tovar/LatinContent/Getty Images)
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Commissioned by the Inter-American Commission on Human Rights (IACHR) and conducted by respected investigators from Chile, Colombia, Guatemala and Spain, the report blasts holes in the Mexican government's central claim that the students were burned to ashes in the nearby town of Cocula.

"That event never took place," one of the investigators, Carlos Beristain, told reporters on Sunday, citing evidence from the site. "There should be a refocusing of the investigation based on these facts."

The parents of the victims cheered the report, and vowed not to let up on the government until their children are found, adding their faith is with the independent experts and they no longer trusted official investigators.

"We've had enough of the government's crap," Mario Cesar Gonzalez, the father of one of the missing students, said at a press conference. "We're poor, but we're not stupid."

Mexico Attorney General Arely Gomez said she would seek a new probe to ascertain whether the missing students were in fact burned in the dump, adding that the government will extend the stay of the independent experts so they can keep investigating.

On Twitter, Peña Nieto thanked the IACHR for its report, and said the government would analyze the findings and incorporate them into its investigation.

"DAMNING INDICTMENT"

"This report provides an utterly damning indictment of Mexico's handling of the worst human rights atrocity in recent memory," said Jose Miguel Vivanco, Americas Director at Human Rights Watch. "Even with the world watching and with substantial resources at hand, the authorities proved unable or unwilling to conduct a serious investigation."

So far, only one of the missing students has been identified from the badly charred remains found at the dump.

Peña Nieto's government says the students were abducted by corrupt local police, working in league with a local drug gang, who confused the students with members of a rival cartel.

Citing confessions of the alleged perpetrators, it says the police then handed them over to members of the local cartel, known as "Guerreros Unidos," or "United Warriors," who took them to the local dump and incinerated them.

But a Reuters report published this week showed the government probe was plagued by a litany of errors, and that key parts may need to be redone.

The IACHR experts were unable to determine what happened to the students, saying that much is still unknown, but they did suggest avenues for closer investigation.

For example, they flagged the fact that missing evidence includes a bus seen on security camera footage from the night of the attack. The students commandeered several buses that night and local police opened fire on them.

In their report, the experts suggested the missing bus may have been carrying a shipment of cash or drugs, citing the fact that prosecutors in Chicago found that the Guerreros Unidos cartel transports heroin from Iguala to the United States in secret bus compartments.

The issue should be investigated and may be the motive for the attack, the experts said.

In recent months, they have conducted dozens of interviews with detainees and witnesses, and examined the possible role of an army battalion located only a few blocks from where most of the students are believed to have been abducted.

The team was denied interviews, however, with 26 soldiers who had contact with the students that night.

(Reporting by Gabriel Stargardter, Anahi Rama, Lizbeth Diaz; Editing by Simon Gardner,Kieran Murray and G Crosse)

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