Uber self-driving vehicle hits, kills woman in Arizona

An Uber self-driving car drives down 5th Street on March 28, 2017 in San Francisco, California. (Photo by Justin Sullivan/Getty Images)

TEMPE, Ariz. — Police in Arizona say one of Uber's self-driving vehicles has struck and killed a pedestrian.

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 said 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.

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Uber says on Twitter that it is "fully cooperating" with the investigation and expressed condolences to the family of the victim.

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

The Associated Press contributed to this report.