The United States has opened an investigation into Tesla‘s Autopilot system, citing incidents of collisions with parked emergency vehicles, according to documents from the National Highway Traffic Safety Administration.

The investigation will look into an estimated 765,000 Tesla Model Y, X, S, and 3 vehicles from 2014-2021 model years. The NHTSA said the inquiry commenced after 11 crashes occurred, which resulted in one death and 17 injuries.