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PITTSBURGH (KDKA) — Police are investigating after a BB gun was apparently fired inside a Woodland Hills school bus.

Woodland Hills Superintendent James Harris said Wednesday that a school bus driver noticed that a window on the bus was shattered, which they believed was caused by a bullet.

Police determined it was most likely shattered by a BB gun from inside the bus. Surveillance footage is being reviewed to determine what happened.

No students were injured, and Harris says no incident happened while the bus was being driven.