Tesla's autopilot is being investigated after a fatal crash

Federal regulators are investigating Tesla's autopilot feature after a fatal crash involving a tractor trailer and one of its Model S cars. The U.S. National Highway Traffic Safety Administration opened the investigation after a man was killed while driving a Model S with the self-driving mode engaged. "This is the first known fatality in just over 130 million miles where Autopilot was activated," Tesla said in a statement Thursday. It called the incident a "tragic loss." The car was on a divided highway when a tractor trailer apparently turned in front of it.