UPDATE, 8:47 a.m.: Philadelphia police say a total of 31 school buses were damaged while parked at a Woodhaven Road lot on Sunday.
The vandalism spree occurred sometime between 6 and 6:30 p.m. Sunday, police spokeswoman Officer Christine O'Brien said. The damage to the buses included shattered windshields and side windows, as well as displaced windshield wipers.
A damage estimate is not yet available.
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A total of 21 Philadelphia school buses were damaged by vandals while parked at a lot in Northeast Philadelphia over the weekend.
Damage to the buses parked on the 3800 block of Woodhaven Road was discovered about 7 p.m. Sunday, 6ABC Action News reports.
The buses' windows were smashed out.