Kathmandu, April 20. Two people were killed in Texas in the fiery crash of a Tesla and authorities say there was no one in the driver’s seat at the time of the crash, although it’s not clear whether the car’s driver-assist system was being used.

A Harris County constable told television stations in Houston that there was a person in the front passenger seat and another in a rear passenger seat after the wreck Saturday night in the Houston suburb of Spring.

Harris County Precinct 4 Constable Mark Herman said authorities are certain that no one was driving the car at the time of the crash.

“They feel very confident just with the positioning of the bodies after the impact that there was no one driving that vehicle,” Herman told KHOU-TV.

Deputies said the car was traveling fast and failed to navigate a turn before running off the road, hitting a tree, and bursting into flames. The identity of the victims had not been released by Sunday afternoon. KHOU reported that one was 69 and the other was 59.

Federal traffic-safety officials are investigating several Tesla crashes in which the vehicle’s Autopilot function may have been used, including crashes in which cars drove under tractor-trailers.

Tesla did not immediately respond to an email requesting comment.

Tesla CEO Elon Musk wrote on Twitter on Monday that data logs “recovered so far” show Autopilot wasn’t turned on, and “Full Self-Driving” was not purchased for the vehicle. He didn’t answer reporters’ questions posed on Twitter.