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."
The James A. Byrne U.S. Courthouse in Philadelphia was vandalized last night at approximately 10:30. Two windows were broken with a cobblestone brick that was left at the scene. Federal Protective Service (FPS) is reviewing video surveillance and is the lead investigating agency. pic.twitter.com/Sd1lUsVvHu
— U.S. Marshals Service Philadelphia (@USMS_Philly) December 9, 2025
Supervisory Deputy U.S. Marshal Robert Clark told the Inquirer that it is unclear whether the vandalism was a targeted act. Investigators are looking into potential links to similar crimes in Old City on Monday.
The courthouse is home to the U.S. District Court for the Eastern District of Pennsylvania and the U.S. Court of Appeals for the Third Circuit.
The U.S. Marshals Service and Philadelphia Police Department did not immediately respond to a request for comment.
This story has been updated with remarks from the Department of Homeland Security.