Armed man sparks alert from US Capitol Police to shelter in place

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A security threat near the U.S. Capitol Building in Washington D.C. that forced police to issue an alert to shelter in place has been cleared.

The incident happened just before 8 a.m. Thursday at the Longworth House Office Building, south of the Capitol, when officers at a security checkpoint spotted the image of a handgun in a bag on the x-ray screen and started searching for the owner.

John Parkinson, a reporter for ABC, said U.S. Capitol Police sent an email warning of a security threat. The email told staff inside the building to seek cover in the nearest office or find a place to hide and remain quiet.

Em Nguyen, also a reporter for ABC News, said "Security Threat, Security Threat" was repeating on the building's intercom.

Four minutes after the gun was spotted, police said officers tracked down the man, identified as as 57-year-old Jeffrey Allsbrooks. Police said Allsbrooks, a staffer with the House Chief Administrative, told officers he forgot the gun was in the bag. He's now facing charges of carrying a pistol without a license.

An investigation is ongoing. Police said they are looking into "what happened before, during and after those four minutes" between when the gun was discovered and Allsbrook was located.