The incident began when guards at the main checkpoint to enter Travis AFB saw a vehicle moving slowly towards the checkpoint, said a U.S. official.

When they motioned for the vehicle to stop the car ignited and ended up rolling onto a median towards the opposite lane of traffic, the official said.

It appeared there were propane tanks inside the vehicle, the U.S. official said.

\"PHOTO:
Air Force Forum/Facebook
PHOTO: Explosion at Travis Air Force base, March 21, 2018.
>

There were no shots fired during the incident, a defense official told ABC News. The official added that the driver of the vehicle was a civilian, not a service member.

The U.S. official said investigators are looking at a broad range of potential motives, including whether the driver was mentally unstable, or whether it could be possible terrorism or a suicide.

The official said investigators are in the initial stages of the investigation and there are more questions than answers about this incident.

The Air Force said there are no current known threats to Travis or its community. The main gate has reopened, and all facilities are operating normally.

ABC News' Alex Stone and Elizabeth McLaughlin contributed to this report.

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