The union representing Culver City firefighters whose truck was hit around 8:30 a.m. on Interstate 405 in Culver City tweeted that the Tesla driver said he had been using Tesla’s Autopilot system, which performs automated driving tasks.

The California Highway Patrol and Culver City Fire Department confirmed the southbound Tesla had struck the fire truck, but could not immediately confirm whether the vehicle had been on Autopilot.

The fire truck had been parked in the left emergency lane and carpool lane, blocking off the scene of a previous accident, with a CHP vehicle behind it and to the side, said Culver City Fire Department battalion chief Ken Powell.

Both emergency vehicles had their lights flashing, Powell added