Police are searching for the people responsible for vandalizing more than 30 Philadelphia school buses.
School District officials made the discovery around 7 p.m. Sunday at their bus yard located at 3801 Woodhaven Road in Northeast Philadelphia.
Police say 21 buses were vandalized Sunday and 17 others were damaged several months ago.
Police believe that fire extinguishers were used to break through the front windows of the buses.
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