Uber said it is suspending self-driving car tests in all North American cities after a fatal accident.

A 49-year-old woman was hit by a car and killed as she crossed the street in Tempe, Arizona.

While self-driving cars have been involved in multiple accidents, it is thought to be the first time an autonomous car has been involved in a fatal collision.

Uber chief Dara Khosrowshahi said the death was "incredibly sad news"dara khosrowshahi

@dkhos
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.