The German news agency dpa reported today that the truck overturned on a curve in the road in the Baden-Wuerttemberg town of Nagold, about 30 kilometers (19 miles) southwest of Stuttgart.
Police say the family of four included two children. A fifth who hasn't yet been identified also was killed.
Police say the cause of the midday crash hasn't been determined, but investigators were looking into whether the truck had a mechanical problem.
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