Ed Donovan, a spokesman for the USSS, told ABC News the truck carrying equipment was stolen between late Saturday night and early Sunday morning at the Westin Hotel in Detroit. He would not specify what kind of equipment was in the truck.
Biden's speech at the Metro Detroit AFL-CIO Labor Day Rally in downtown Michigan will still go on as planned starting at noon Monday.
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They probably left the keys in it, not suspecting that there might be criminals in Detroit.
It's an understandable mistake.