A woman near Phoenix, in Tempe, Arizona has become the first person to be hit and killed by a self-driving Uber vehicle, media outlets are reporting.

Media outlets are reporting that the woman was a pedestrian, but a news report by ABC15 Arizona reported that the self-driving Uber vehicle hit a bicyclist.

Uber has responded by suspending all self-driving vehicles in the Phoenix area and other cities. The service was reportedly also being tested in San Francisco, Toronto and Pittsburgh.

The Associated Press reported: Police in the city of Tempe said Monday that the vehicle was in autonomous mode with an operator behind the wheel when the woman walking outside of a crosswalk was hit.

Sgt. Ronald Elcock says in an email that the accident happened overnight but did not say whether it occurred Sunday night or Monday morning.

The woman died of her injuries at a hospital and her name was not made public.

Uber has been testing the self-driving vehicles in Tempe and Phoenix for months.

Uber released the following statement on Twitter in response to the fatal incident: “Our hearts go out to the victim’s family. We are fully cooperating with local authorities in their investigation of this incident.”

This is a developing story.

“Some incredibly sad news out of Arizona. We’re thinking of the victim’s family as we work with local law enforcement to understand what happened,” tweeted Uber CEO Dara Khosrowshahi .