Police say a letter containing suspicious white powder was sent to the Philadelphia office of U.S. Sen. Pat Toomey.
Investigators say Toomey's downtown office received the letter around 2:30 p.m. Thursday and that police and firefighters responded. Officer Jillian Russell, a police spokeswoman, says authorities are conducting tests on the substance, but have not yet identified it. It wasn't immediately clear what the letter said.
No injuries were reported. A Toomey spokeswoman says the matter has been referred to law enforcement.
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Earlier this week, law enforcement officials said some congressional offices outside Washington and media organizations had received threatening letters containing a suspicious powdery substance that was tested and proved to be harmless.
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