The videos, which CNN has not reviewed, appear to have been recorded while he was driving at night, the officials said, although the exact timing is unclear.

Jabbar was killed while exchanging fire with police after ramming the truck through the crowd in the early hours of New Year’s Day. He had potential improvised explosive devices and an ISIS flag in the truck he drove, according to local and federal authorities.

Now, law enforcement authorities are reviewing the videos Jabbar made as they rush to piece in details about how he went from a military veteran to a suspect in a deadly rampage.

Jabbar served in the Army for more than a decade, an Army spokesperson told CNN on Wednesday. He served as a human resource specialist and information technology specialist on active duty between March 2007 and January 2015, and deployed to Afghanistan once from February 2009 to January 2010, the spokesperson said. After leaving active duty in January 2015, Jabbar served in the Army Reserve until July 2020, when he left service as a staff sergeant.

Jabbar was born in Beaumont, Texas, he said in a 2020 YouTube video titled “Personal Introduction,” in which he pitched himself as a professional real estate agent based in Houston.