DUQUESNE — Police in say a patrol car pursuing a speeding vehicle struck a bus, injuring three people.

Duquesne police were chasing a speeding motorist shortly before 12:30 p.m. Saturday when the speeding vehicle went through a red light. A bus with a green light went into the intersection, and the officer tried to stop and swerved, but the patrol car hit the rear driver's side of the bus.