Governor Doug Ducey of Arizona wrote in a letter sent to Dara Khosrowshahi, Uber's chief executive that the death of a pedestrian on March 18 was "an unquestionable failure to comply" with an expectation that Uber would make public safety a priority. Ducey said he was troubled by a video released from the Tempe Police Department that seemed to show that neither the Uber safety driver nor the autonomous vehicle detected the presence of a pedestrian in the road in the moments before the crash.

According to the New York Times, Uber had already suspended all testing of its cars in Arizona, San Francisco, Pittsburgh, and Toronto.

A spokes Uber said: "We proactively suspended self-driving operations in all cities immediately following the tragic incident last week. We continue to help investigators in any way we can, and we'll keep a dialogue open with the governor's office to address any concerns they have."

However, the governor's letter is a reversal from what has been an open-arms policy by the state, which resulted in a lack of regulation to lure autonomous vehicle testing - and tech jobs to the State.

Waymo, the self-driving car company spun out from Google, and General Motors owned Cruise are testing cars in the state.

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