WASHINGTON (AP) — Police closed off entries and exits at the Senate's Dirksen Office Building for several hours Monday after something set off an alarm for the presence of nerve agents.

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Sgt. Kimberly Schneider, a Capitol Police spokeswoman, said an alarm went off about 4:50 p.m. indicating a suspicious substance near a basement post office facility. An all-clear was declared about 8:15 p.m., after tests proved negative.

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