2 Officers At U.S. Capitol Building Hit By Vehicle, 1 Killed; Suspect Also Dead (CBS News)

UPDATE: The U.S. Capitol police say they are responding to reports of someone ramming a vehicle into two U.S. Capitol police officers. The suspect is in custody and both officers are injured.

Read the previous story below.

WASHINGTON (AP) -- Police have locked down the U.S. Capitol after a report of gunshots in the area.

U.S. Capitol Police said early Friday afternoon that all Capitol buildings were being locked down "due to an external security threat" and staff members were told they could not enter or exit the buildings.

A law enforcement official says officers were responding to a report of a possible shooting on a street near the Capitol complex.

It wasn't immediately clear if anyone was injured. The official could not discuss an ongoing investigation publicly and spoke to The Associated Press on condition of anonymity.

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