PHILADELPHIA (CBS) – Philadelphia police investigated a potential haz-mat situation in the city on Thursday after an envelope filled with a white, powdery substance was sent to Senator Pat Toomey’s office.

The incident occurred around 3 p.m. at the Senator’s office on the 17th floor of 8 Penn Center, when an intern reportedly opened the mail containing the powder.

Police arrived on the scene shortly thereafter, and the envelope was placed in an empty office while they investigated. A letter was also received along with the powder, but details of what was written in it have not been disclosed.

Recently, several other district offices of members of Congress, including House Speak John Boehner, reportedly received letters containing a similar substance. That substance proved to be harmless after undergoing tests.

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