The National Highway Traffic Safety Administration is investigating the crash of a speeding Tesla that killed two people in a Los Angeles suburb, the agency announced Tuesday.

Agency spokesman Sean Rushton wouldn’t say whether the Tesla Model S was on Autopilot when it crashed on Dec. 29 in Gardena. That system is designed to automatically change lanes and keep a safe distance from other vehicles.

The black Tesla had left a freeway and was moving at a high rate of speed when it ran a red light and slammed into a Honda Civic at an intersection, police said. A man and woman in the Civic died at the scene.

A man and woman in the Tesla were hospitalized with non-life threatening injuries. No arrests were immediately made.

An NHTSA statement said the agency has assigned its special crash investigation team to inspect the car and the crash scene.