Vandals used a cobblestone brick to shatter a pair of windows at Philadelphia's federal courthouse Monday night, investigators say.

The U.S. Marshals Service said the vandalism at the James A. Byrne Courthouse in Old City occurred around 10:30 p.m. Investigators found the brick outside the building at 601 Market St.

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The Federal Protective Service is leading the investigation and is reviewing video surveillance, the U.S. Marshals said Tuesday night.

A spokesperson for the Department of Homeland Security confirmed that the incident is under investigation and that the FPS "will share updates when they are available."

Supervisory Deputy U.S. Marshal Robert Clark told the Inquirer that it is un

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