RedactedNarrative: On 07-03-20 at 1904hrs, an injury watercraft accident occurred on the Colorado river in the 1000blk of Highway 95 Bullhead City AZ. Both vessels one and two were north bound on the river (AZ side) when vessle one struck vessel two from behind. Passenger on vessel two reported a lower back injury due to being struck by vessel one. Operator of vessel one only gave name of German to operator of vessel two then left the scene. Passenegr of Vessel was treated at local hospital then released. Operator of vessel one not contacted due leaving the scene and insufficent information given.