One of Uber’s self-driving vehicles struck and killed a pedestrian in Arizona early on Monday morning.

The incident occurred in the early morning on March 19th in the Tempe suburb of Phoenix, Arizona.

According to Tempe Police Sergeant Ronald Elcock, a woman was crossing the street outside of a crosswalk when she was struck by the self-driving Uber vehicle. The unidentified woman was then transported to a nearby hospital, where she later died of her injuries.

The self-driving Uber was in autonomous mode with a person in the driver’s seat as a precaution at the time of the crash. That driver’s name has also not been released, reported CNBC.

Uber soon issued a statement assuring that they are cooperating with local authorities and that they have paused the testing of their self-driving vehicles in all participating cities.

The incident is still under investigation.

Uber halts autonomous vehicle tests after deadly accident from CNBC.