Arizona Gov. Doug Ducey (R) on Monday rescinded Uber’s ability to test its self-driving vehicles in the state following a fatal crash involving the technology earlier this month near Phoenix.

The Arizona Republic reported that Ducey wrote the company a letter that indicated video of the crash raised safety concerns. He called the crash an “unquestionable failure."

"Improving public safety has always been the emphasis of Arizona's approach to autonomous vehicle testing, and my expectation is that public safety is also the top priority for all who operate this technology in the state of Arizona," Ducey wrote.

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On March 18, a self-driving Uber car struck and killed 49-year-old Elaine Herzberg, who was crossing the street at night. It was the first pedestrian fatality involving a self-driving vehicle.

Police said an Uber employee was in the driver’s seat at the time but was in autonomous-driving mode. It was going 40 mph in a 45 mph zone, and did not slow down before hitting Herzberg.

A video released this week from inside the vehicle involved in the crash shows the driver not paying attention to the road until seconds before the crash.

Uber suspended testing of its self-driving vehicles following the crash.