A false alarm triggered the evacuation of the Hart and Dirksen Senate officebuildings shortly after noon today.

“It appeared one of the fire alarms had been pulled on the 8th floor of the Hart Building,” said Capitol Police spokeswoman Sgt. Contricia Sellers-Ford.

The police conducted a floor-by-floor sweep, but found no smoke, and at 12:45 p.m. cleared the building for re-entry.

On Thursday, the Cannon House Office Building Rotunda was also briefly evacuated when a suspicious yellow substance was discovered there around 5:20 p.m. Preliminary testing by the Capitol Police Hazardous Device Unit deemed the substance negative, and the area was declared safe shortly after 6 p.m.