Turo, which investigators say was used to acquire the vehicles involved in the attack in New Orleans and explosion in Las Vegas, was emerging as an alternative car-rental service.

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The two episodes have superficial similarities, including that both suspects used the same car rental app.

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Renters of both vehicles had used Turo, a peer-to-peer app. Officials are investigating possible connections between the two cases.

© Edmund D. Fountain for The New York Times