TEMPE, Ariz. (AP) — Officials say a self-driving Uber SUV was operating on its own when it was struck by another vehicle making a left turn at an intersection in Arizona, where the company is testing autonomous vehicles.

No one was seriously injured. Uber says its vehicles have been grounded as it investigates.

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Police in Tempe say the self-driving SUV was obeying the law and the driver in the other car who didn’t yield was cited for a moving violation after the Friday night crash.

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An Uber statement Saturday says there were no passengers in the self-driving Volvo SUV at the time of the crash but there were two operators in the front.

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Police say the Uber rolled over onto its side as a result of the collision.