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In this March 20, 2018, file photo investigators examine a driverless Uber SUV that fatally struck a woman in Tempe, Ariz. In a preliminary report on the crash released Thursday, May 24, federal investigators said the autonomous Uber SUV that struck and killed an Arizona pedestrian in March spotted the woman about six seconds before hitting her, but didn’t stop automatically because emergency braking was disabled. (National Transportation Safety Board via AP, File)

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Federal investigators say the autonomous Uber SUV that struck and killed an Arizona pedestrian in March spotted the woman about six seconds before hitting her, but didn't stop because emergency braking was disabled.

By TOM KRISHER, AP Auto Writer May 24, 2018