Hazmat teams tested a white powdery substance sent to U.S. Rep Mike Doyle's office on Wednesday causing the building to temporarily close down. A staff member in Doyle's Washington D.C. office opened a letter containing a grainy white substance and immediately alerted Capitol police. The tests of the substance came back negative and the quarantine of Room 239 of the Cannon House Office building was removed at 3:37 p.m. on Wednesday, reports Triblive. Temporary shutdown: Capitol Police secure as officers begin to remove hazmat suits in a hallway in the Cannon House Office Building after a suspicious powder was discovered on Wednesday . A powdery white substance was found in the office of Rep. Mike Doyle, D-Forest Hills (pictured) but it was found to be a non-harmful substance . The congressman said that the Capitol police were 'prompt and professional.' The white substance was cause for concern after powdered anthrax was mailed to members of congress in 2001 following the September 11 attacks. After testing, assistant who opened the envelope was not advised to seek medical attention and was simply told to wash her hands. Doyle was concerned for the well-being of his staffer but remained calm throughout the ordeal and maintained a sense of humor. 'I’m sure they won’t forget their visit,' Doyle said of the four visitors under lockdown in his office along with his staff. 'I live in Pittsburgh. We’re not afraid of anything,' Doyle joked, according to the Hill Blotter. 'All clear with nothing hazardous found. The area has been reopened,' department spokesman Shennell Antrobus said in an email. The testing lasted just under two hours. The substance has not yet been identified and neither has its sender but an investigation is ongoing. Fearful: Capitol Hill workers wait as Capitol Police secure a hallway in the Cannon House Office Building after a suspicious powder was discovered at the Cannon House office building office of Rep. Mike Doyle .
Hazmat teams tested a white powdery substance sent to U.S. Rep Mike Doyle's office on Wednesday causing temporary building shutdown .
The white substance came back as negative and after just under two hours the Congressman was able to return to his office .
'I live in Pittsburgh. We’re not afraid of anything,' Doyle reportedly joked .