PHILADELPHIA (WPVI) -- Federal authorities are trying to figure out who smashed two windows at the U.S. Courthouse in Center City Philadelphia.

Pictures from the marshals service show the vandalism that happened Monday night around 10:30 p.m.

A cobblestone brick used to break the windows was left at the scene on Market Street, between 6th and 7th Streets.

The damaged windows are now boarded up.

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