Uber temporarily suspended testing of its self-driving cars in Tempe, Pittsburgh, San Francisco and Toronto.

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“Our hearts go out to the victim’s family,” a spokesperson said. “We are fully cooperating with local authorities in their investigation of this incident.”

Shortly after the crash became known, Uber CEO Dara Khosrowshahi called the news “incredibly sad.”

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Nearly a year ago, Uber had to temporarily ground its self-driving car tests, after one of its self-driving Volvos got involved in a three-way crash. The latest incident is sure to draw attention of both regulators—the National Transportation Safety Board already said it’s launching an investigation—and autonomous car developers, who’ve raced to introduce the technology onto public roads with little oversight from policymakers.

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Update (4:15 p.m.): Tempe police are now saying that Herzberg was pushing a bicycle across the street when she was struck. A press conference is scheduled for 6 p.m. EDT.

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With reporting from Erik Shilling