A man who drove into Travis AFB has been identified as 51-year-old Hafiz Kazi, two sources with knowledge of the probe told ABC News.

The sources described Kazi as a “nomad” and a “vagabond,” who lived in many places.

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Authorities extracted a video from his cell phone and are analyzing it to try and see if it could help point to a motive. Sources wouldn’t offer any details about the video. The FBI is holding a press conference Friday at 3:30 p.m. and will be asking the public for help and any information about Kazi. Sources say the information gathered so far still does not point to a concrete motive, with one source calling the man a “mystery” still. Terrorism, mental health issues, and everything else are still on the table as authorities try to uncover a motive.

On Wednesday, the car crashed at the main gate of Travis Air Force Base. Officials are treating it as a possible attempted attack. The FBI is now leading the investigation.