Police chief: Christmas festivities may have sparked San Bernardino attack

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Authorities in San Bernardino say a mandatory work meeting held in a room filled with Christmas decorations may have been one of the triggers of the attack Syed Farook and his wife Tashfeen Malik instigated nearly one year ago, on December 2, 2015.

On a recent episode of the ABC News program "Nightline," the city's police chief Jarrod Burguan, states about Malik, "She had essentially made the statement in an online account that she didn't think that a Muslim should have to participate in a non-Muslim holiday or event."

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He goes on to say, "And you could clearly see from pictures inside that room that there was somewhat of a festive atmosphere so it had those Christmas overtones to it. That really is one of the very, very few pieces of potential evidence that we have that we can truly point to and say, 'that possibly is a motive in this case.'"

Learn more about the San Bernardino attack:

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San Bernardino active shooter, scene and police operations
REDLANDS, CA - DECEMBER 2: A SWAT team member stands watch with a rifle pointed at a home being investigated by police is shown after a mass shooting at the Inland Regional Center in San Bernardino December 2, 2105 in Redlands, California. Multiple fatalities and injuries were reported in the shooting (Photo by Marcus Yam/Los Angeles Times via Getty Images)
Law enforcement officers investigate a suspicious bag, later found not to be a threat, on Victoria Avenue after a mass shooting at the Inland Regional Center on Wednesday, December 2, 2015 in San Bernardino, California. At least 14 people were killed in a gun attack on a holiday party, triggering a massive manhunt that ended when police shot dead two heavily armed suspects -- a man and a woman -- on a quiet residential street. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, USA - DECEMBER 02: Yellow stripe is seen as the US Security Forces secure the area following a shooting that killed multiple people at a social services center for the disabled in San Bernardino, California of United States on December 02, 2015. Two suspects in a deadly mass shooting that killed 14 victims at a social services facility in California were killed after a confrontation with police, authorities said Wednesday. The initial shooting occurred earlier Wednesday when at least one shooter opened fire in San Bernardino at the Inland Regional Center, which provides services to persons with developmental disabilities and their families. At least 17 others were injured. (Photo by Mintaha Neslihan Eroglu/Anadolu Agency/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A police officer officer guards a police line as officers prepare to raid the home of one or more suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 near San Bernardino, California. Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by David McNew/Getty Images)
(Photo: Inside Edition)
SAN BERNARDINO, CA - DECEMBER 2: Police place a marker along E. San Bernardino Ave. where a shootout occurred December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Rick Loomis/Los Angeles Times via Getty Images)
Armed police personnel walk along closed off streets in the San Bernardino neighborhood near the intersection of Richardson and Gould where a house was searched on December 2, 2015. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled in California were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A police helicopter circles as officers search for a possible suspect following a shootout with suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 in San Bernardino, California. Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by David McNew/Getty Images)
Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
(Photo: Inside Edition)
(Photo: Inside Edition)
(Photo: Inside Edition)
(Photo: Inside Edition)
(Photo: Inside Edition)
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(Photo: Inside Edition)
Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A SWAT unit mobilizes near Richardson Street after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Law enforcement officers search for a possible suspect following a shootout with suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 in San Bernardino, California. Numerous deaths and injuries have been reported. (Photo by David McNew/Getty Images)
Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINA, CA - DECEMBER 2: A search team goes door-to-door looking for the third suspect in a residential neighborhood after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A California Highway Patrol officer stands with his weapon as authorities pursued the suspects in a shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A California Highway Patrol officer stands with his weapon as authorities pursued the suspects in a shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A San Bernadino Sheriff helicopter flys above a neighborhood as authorities pursue suspects of the shooting at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Officers swarm San bernardino Ave at Richardson Street near where suspects were shot in a black SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Irfan Khan/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Ambulances leave the scene of a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police draw guns on San Bernardino Avenue while chasing suspects in an SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Francine Orr/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police draw guns on San Bernardino Avenue while chasing suspects in an SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Francine Orr/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and emergency vehicles line Waterman Avenue in front of the Inland Regional Center in San Bernardino, scene of a mass shooting on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Luis Sinco/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and emergency vehicles line Waterman Avenue in front of the Inland Regional Center in San Bernardino, scene of a mass shooting on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Luis Sinco/Los Angeles Times via Getty Images)
Police at the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Members of the FBI Joint Terrorism Task Force stand outside of a press conference regarding the shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Ambulances pull out of a staging area near the Inland Regional Center where a shooting occurred earlier in the day on December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by Sean M. Haffey/Getty Images)
A heavily armed officer sets up a perimeter near the site of a shooting that took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: San Bernardino County Sheriffs deputies respond to a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A San Bernardino County Sheriffs Department investigator responds to a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Employees and other people are evacuated by bus from the site of a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
Police escort civilians away from the 1300 block of S. Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Police escort civilians away from the 1300 block of S. Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Armed Sheriff's department personel man a roadblock at Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and fire personnel secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: San Bernardino police offices in SWAT gear secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
A crowd gathers behind police line near the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
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The program, in fact, shows a picture of Farook with co-workers in front of a Christmas tree.

The Los Angeles Times reports that despite an effort which includes hundreds of pieces of evidence, investigators still don't have a clear picture as to who else may have been involved in the plot.

The couple killed 14 people at the Inland Regional Center on December 2 before dying in a shootout with police hours later.

See more about the victims of this attack:

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San Bernardino funerals
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San Bernardino funerals
HUNTINGTON BEACH, CA - DECEMBER 12: Van Thanh Nguyen, center, mother of Tin Nguyen, 31, one of the victims of the deadly San Bernardino terrorist attack, is consoled by family members during her daughter's funeral service at the Good Shepherd Cemetery, in Huntington Beach, Calif., on Dec. 12, 2015. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
HUNTINGTON BEACH, CA - DECEMBER 12: Nghi Van Nguyen, grandmother of Tin Nguyen, 31, one of the victims of the deadly San Bernardino terrorist attack, weep at her casket during her funeral service in Huntington Beach, Calif., on Dec. 12, 2015. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SANTA ANA, CA - DECEMBER 12: Pallbearers stand guard over the casket of the slain Tin Nguyen, 31, one of the victims of the deadly San Bernardino terrorist attack, at the start of the memorial service at St. Barbara's Catholic Church, in Santa Ana, Calif., on Dec. 12, 2015. (Marcus Yam / Los Angeles Times)
SANTA ANA, CA - DECEMBER 12: Community members attend the funeral for Tin Nguyen, 31, one of the victims of the deadly San Bernardino terrorist attack, at St. Barbara's Catholic Church, in Santa Ana, Calif., on Dec. 12, 2015. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
COLTON, CA - DECEMBER 12: A woman consoles a man during a funeral service for San Bernardino shooting victim Isaac Amanios at the St. Minas Orthodox Church in Colton Saturday. (Photo by Wally Skalij/Los Angeles Times via Getty Images)
SANTA ANA, CA - DECEMBER 12: San Trinh, long time boyfriend of of Tin Nguyen, holds a photo after her coffin was loaded into a hearse at her funeral held at St. Barbaras Catholic Church in Santa Ana, CA on Saturday, December 12, 2015. A heavily armed man and woman opened fire Wednesday on a holiday banquet for his co-workers, killing multiple people and seriously wounding others in a precision assault, authorities said. Hours later, they died in a shootout with police. (Photo by Jabin Botsford/The Washington Post via Getty Images)
HUNTINGTON BEACH, CA - DECEMBER 12: Tram Le, center, cousin of Tin Nguyen, holds a cooler of Tin's during her burial held at Good Shepherd Cemetery in Huntington Beach, CA on Saturday, December 12, 2015. Tin Nguyen was one of 14 that died after a heavily armed man and woman opened fire Wednesday on a holiday banquet for his co-workers, killing multiple people and seriously wounding others in a precision assault, authorities said. Hours later, they died in a shootout with police. (Photo by Jabin Botsford/The Washington Post via Getty Images)
SANTA ANA, CA - DECEMBER 12: Family members of Tin Nguyen carry her coffin to a hearse at her funeral held at St. Barbaras Catholic Church in Santa Ana, CA on Saturday, December 12, 2015. A heavily armed man and woman opened fire Wednesday on a holiday banquet for his co-workers, killing multiple people and seriously wounding others in a precision assault, authorities said. Hours later, they died in a shootout with police. (Photo by Jabin Botsford/The Washington Post via Getty Images)
COLTON, CA - DECEMBER 12: The three children of San Bernardino shooting victim Isaac Amanios speak next to their fathers casket during funeral services at the St. Minas Orthodox Church in Colton Saturday. (Photo by Wally Skalij/Los Angeles Times via Getty Images)
COVINA, CALIF. -- THURSDAY, DECEMBER 10, 2015: Attendees weep after seeing a hearse carrying Yvette Velasco's casket, one of the victims of the deadly San Bernardino terrorist attacks, pass by before the funeral service at Forest Lawn Memorial Park, in Covina, Calif., on Dec. 10, 2015. Yvette Velasco is survived by her parents and three sisters. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
COVINA, CA - DECEMBER 10: Family members hug near the casket of 27-year-old Yvette Velasco at the first funeral for victims of the December 2 massacre in San Bernardino on December 10, 2015 in Covina, California. Velasco was attending a holiday luncheon at the Inland Regional Center on December 2 when Syed Farook and Tashfeen Malik entered the room heavily armed and opened fire, killing 14 people and injuring 21 others. (Photo by David McNew/Getty Images)
Family members and friends arrive before a funeral service for Yvette Velasco, killed in the December 2 mass shooting in San Bernardino, at the Forest Lawn in Covina, California on December 10, 2015. Velasco, one of the youngest victims, was at the training and holiday luncheon at the Inland Regional Center when Syed Farook and his wife, Tashfeen Malik, barged in on the gathering and opened fire on his San Bernardino County Department of Public Health coworkers, killing 14 and injuring 22 others in what the FBI is investigating as an 'act of terrorism.' AFP PHOTO/ RINGO CHIU / AFP / RINGO CHIU (Photo credit should read RINGO CHIU/AFP/Getty Images)
Family members, friends, and law enforcement members attend the funeral service for Yvette Velasco, killed in the December 2 mass shooting in San Bernardino, at the Forest Lawn in Covina, California on December 10, 2015. Velasco, one of the youngest victims, was at the training and holiday luncheon at the Inland Regional Center when Syed Farook and his wife, Tashfeen Malik, barged in on the gathering and opened fire on his San Bernardino County Department of Public Health coworkers, killing 14 and injuring 22 others in what the FBI is investigating as an 'act of terrorism.' AFP PHOTO/ RINGO CHIU / AFP / RINGO CHIU (Photo credit should read RINGO CHIU/AFP/Getty Images)
Family members, friends, and law enforcement members attend the funeral service for Yvette Velasco, killed in the December 2 mass shooting in San Bernardino, at the Forest Lawn in Covina, California on December 10, 2015. Velasco, one of the youngest victims, was at the training and holiday luncheon at the Inland Regional Center when Syed Farook and his wife, Tashfeen Malik, barged in on the gathering and opened fire on his San Bernardino County Department of Public Health coworkers, killing 14 and injuring 22 others in what the FBI is investigating as an 'act of terrorism.' AFP PHOTO/ RINGO CHIU / AFP / RINGO CHIU (Photo credit should read RINGO CHIU/AFP/Getty Images)
COVINA, CA - DECEMBER 10: Friends and loved ones pass graveside Christmas decorations as they arrive for funeral services for 27-year-old Yvette Velasco, the first funeral for victims of the December 2 massacre in San Bernardino, on December 10, 2015 in Covina, California. Velasco was attending a holiday luncheon at the Inland Regional Center on December 2 when Syed Farook and Tashfeen Malik entered the room heavily armed and opened fire, killing 14 people and injuring 21 others. (Photo by David McNew/Getty Images)
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