People enter the headquarters of Uber in San Francisco on...

People enter the headquarters of Uber in San Francisco on March 1, 2017. Credit: AP/Eric Risberg

TEMPE, Ariz. —Uber says it has suspended all of its self-driving testing following what is believed to be the first fatal pedestrian accident involving the vehicles.

The self-driving testing has been taking place in Phoenix, Pittsburgh, San Francisco and Toronto.

Automakers and tech companies are competing to be first with the technology.

Police in a Phoenix suburb say one of Uber's self-driving vehicles struck and killed a pedestrian on Sunday night.

Investigators say the vehicle was in autonomous mode with an operator behind the wheel when the woman walking outside of a crosswalk was hit.

The woman died of her injuries at a hospital.

Uber CEO Dara Khosrowshahi expressed condolences on his Twitter account. The company is working with local law enforcement on the investigation.

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