The U.S. government has asked Tesla Motors for detailed information about key safety systems on its cars after a May 7 crash in which a driver was killed while traveling in autonomous mode.

In the accident, a Tesla Model S in autopilot mode failed to recognize a truck being driven across the highway in front of it and slammed into it. The roof of the car was torn off and the driver was killed.

In a letter sent to Palo Alto-based Tesla Motors, the National Highway Traffic Safety Administration (NHTSA) is asking for details of all incidents in which automatic emergency braking was initiated and automatic steering warnings were recorded.

The NHTSA says it is asking for the information as part of an investigation into “all crashes alleged to have occurred because forward collision warning or automatic emergency braking did not occur when expected.”

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