Horrifying aftermath of Syria's chemical attack seen in graphic footage

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One day after what the New York Times describes as "one of the worst chemical bombings in Syria," graphic images show the horrifying aftermath of the deadly gas attack.

An opposition-run Health Department at the rebel-held attack site in Idlib Province said 69 people -- including children -- had died in Tuesday's chemical attack, while some humanitarian groups are recounting a death toll up to 100.

While the attack is believed to have been a Syrian government-led strike, the Syrian military released a statement blaming insurgents, saying the army is accused of using toxic weapons "every time they fail to achieve the goals of their sponsors."

RELATED: A look at Syria's deadly chemical attack

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ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH A man carries the body of a dead child, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah
ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH People stand near a dead body, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah
A man breathes through an oxygen mask as another one receives treatments, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah
A man breathes through an oxygen mask, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah
ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH Men stand near dead bodies, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah
EDITORS NOTE: Graphic content / A Syrian child receives treatment at a hospital in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, following an attack on April 4, 2017. A suspected chemical attack killed at least 58 civilians including several children in rebel-held northwestern Syria, a monitor said, with the opposition accusing the government and demanding a UN investigation. / AFP PHOTO / Omar haj kadour (Photo credit should read OMAR HAJ KADOUR/AFP/Getty Images)
A man holds an injured baby inside a Turkish ambulance as injured Syrian people enter into Turkey from the Cilvegozu border gate in Hatay province, near the Syrian border on April 4, 2017. Turkish President Recep Tayyip Erdogan in a phone call with Russian counterpart Vladimir Putin on April 4, 2017 condemned a suspected chemical attack in northwestern Syria as an 'inhuman' strike that could endanger peace talks based in the Kazakh capital. / AFP PHOTO / DOGAN NEWS AGENCY / - / Turkey OUT (Photo credit should read -/AFP/Getty Images)
IDLIB, SYRIA - APRIL 4: A wounded kid receives medical treatment at sahra hospital after Assad Regime forces's attack with chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Abdulghani Arian/Anadolu Agency/Getty Images)
IDLIB, SYRIA - APRIL 4: A woman gets treatment at a hospital after Assad Regime forces attacked with suspected chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Bahjat Najar/Anadolu Agency/Getty Images)
IDLIB, SYRIA - APRIL 4: A child gets treatment at a hospital after Assad Regime forces attacked with suspected chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Bahjat Najar/Anadolu Agency/Getty Images)
ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH A man carries the body of a dead child, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah TPX IMAGES OF THE DAY
A crater is seen at the site of an airstrike, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017. REUTERS/Ammar Abdullah TPX IMAGES OF THE DAY
Turkish officials with chemical clothes carry a injured man on April 4, 2017 in Hatay province, near the Syrian border. Turkish President Recep Tayyip Erdogan in a phone call with Russian counterpart Vladimir Putin on April 4, 2017 condemned a suspected chemical attack in northwestern Syria as an 'inhuman' strike that could endanger peace talks based in the Kazakh capital. / AFP PHOTO / DOGAN NEWS AGENCY / - / Turkey OUT (Photo credit should read -/AFP/Getty Images)
EDITORS NOTE: Graphic content / Bodies lie in the parking area of a hospital in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, following a suspected toxic gas attack on April 4, 2017. A suspected chemical attack killed at least 58 civilians including several children in rebel-held northwestern Syria, a monitor said, with the opposition accusing the government and demanding a UN investigation. / AFP PHOTO / Omar haj kadour (Photo credit should read OMAR HAJ KADOUR/AFP/Getty Images)
IDLIB, SYRIA - APRIL 4: A child gets treatment at a hospital after Assad Regime forces attacked with suspected chlorine gas to Khan Shaykhun town of Idlib, Syria on April 4, 2017. (Photo by Bahjat Najar/Anadolu Agency/Getty Images)
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According to the World Health Organization, victims of the gas attack showed symptoms mirroring those in reaction to a nerve agent. The U.S. has said the deaths were caused by sarin nerve gas dropped by Syrian aircraft, while the Syrian ally state of Russia has said the chemicals were likely leaked from a rebel stockpile of gas weapons.

"These types of weapons are banned by international law because they represent an intolerable barbarism," Peter Salama, Executive Director of the WHO Health Emergencies Programme, said in the WHO statement.

WATCH: Aftermath of suspected gas attack on Syria's rebel-held Idlib

The WHO said it was likely that some kind of chemical was used in the attack because victims had no apparent external injuries, but rather suffered from acute respiratory distress. Reports detail that victims choked, gasped and foamed at the mouth in reaction to the chemicals used in the attack.

Syrian use of chemical weapons was previously evidenced when hundreds died in Damascus in a 2013 sarin gas attack. Syrian President Bashar Al-Assad and his government have repeatedly denied responsibility for the attack.

RELATED: White Helmets of Syria

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White Helmets of Syria
Civil defence members carry a casualty after an airstrike at a field hospital in the rebel held area of al-Sukari district of Aleppo, Syria April 27, 2016. REUTERS/Abdalrhman Ismail
Civil defense members search for survivors under the rubble at a site hit by airstrikes in the rebel-controlled town of Ariha in Idlib province, Syria July 13, 2016. REUTERS/Ammar Abdullah
Civil defence members rescue a girl from under the rubble after airstrikes by pro-Syrian government forces in the rebel held al-Qaterji neighbourhood of Aleppo, Syria February 14, 2016. REUTERS/Abdalrhman Ismail 
Members of the Civil Defence rescue children after what activists said was an air strike by forces loyal to Syria's President Bashar al-Assad in al-Shaar neighbourhood of Aleppo June 2, 2014. REUTERS/Sultan Kitaz 
Civil Defence members with blood on their shirts stand after double airstrikes on the rebel held Bab al-Nairab neighborhood of Aleppo, Syria, August 27, 2016. REUTERS/Abdalrhman Ismail
Omar Alwan, 21, a civil defence member, poses for a photograph in Idlib, Syria March 8, 2016. "Before the truce I wouldn't go out from the civil defence building because of my constant fear of the war planes. The first two days of the truce I had the same fear, but it began declining. I am expecting that the peace talks are serious this time," said Omar. "The war will not end in Syria until Bashar Al-Assad leaves." As peace talks are set to get under way in Geneva next week, residents in Syria from nurses to street vendors voice little optimism over the United Nations-backed negotiations' chance of success. The Geneva talks will coincide with the fifth anniversary of a conflict that began with protests against President Bashar al-Assad before descending into a multi-sided war that has drawn in foreign governments and allowed the growth of Islamic State. REUTERS/Khalil Ashawi 
A Civil defence member looks for survivors at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad in the Al-Shaar neighbourhood of Aleppo July 27, 2014. REUTERS/Hamid Khatib 
Civil defense members mourn the death of their comrade, who died during what activists said were airstrikes carried out by the Russian air force, during his funeral in Ehsim town in the south of Idlib province, Syria, October 3, 2015. REUTERS/Khalil Ashawi
Civil defence members hold a demonstration to children during a war safety awareness class in Deraa Governorate, Syria March 5, 2016. REUTERS/Alaa Al-Faqir
A Civil Defence member reacts in a damaged site near the frame of a burnt vehicle after an airstrike on al-Jalaa street in the rebel held city of Idlib, Syria August 10, 2016. REUTERS/Ammar Abdullah
Residents and civil defense members look for survivors at a damaged site after what activists said was a barrel bomb dropped by forces loyal to Syria's President Bashar al-Assad in the Al-Shaar nighbourhood of Aleppo, Syria September 17, 2015. REUTERS/Abdalrhman Ismail
Civil defence members search for survivors after an airstrike at a field hospital in the rebel held area of al-Sukari district of Aleppo, Syria April 27, 2016. REUTERS/Abdalrhman Ismail
Smoke rises over a damaged site as Civil Defence members try to put out a fire after an airstrike on al-Jalaa street in the rebel held city of Idlib, Syria August 10, 2016. REUTERS/Ammar Abdullah
Civil defence members rest amid rubble of damaged buildings after an airstrike on the rebel-held Tariq al-Bab neighbourhood of Aleppo, Syria April 23, 2016. REUTERS/Abdalrhman Ismail Y
 A civil defence member carries a dead child in a site hit by what activists said were airstrikes carried out by the Russian air force in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria January 9, 2016. At least 70 people died in what activists said where four vacuum bombs dropped by the Russian air force in the town of Maaret al-Numan; other air strikes where also carried out in the towns of Saraqib, Khan Sheikhoun and Maar Dabseh, in Idlib. REUTERS/Khalil Ashawi 
Civilians, with the help of Civil Defence members, position sanitation pipes as barricades to provide protection from snipers loyal to Syria's President Bashar al-Assad who are stationed in Aleppo's historic citadel October 12, 2014. REUTERS/Abdalrhman Ismail 
A civil defence member carries an injured girl at a site hit by airstrikes in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria June 2, 2016. REUTERS/Khalil Ashawi 
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