WASHINGTON (AP) A senator is describing the scene outside the U.S. Capitol as shots were fired this afternoon.

Democrat Bob Casey of Pennsylvania told reporters he was walking from the Capitol to the Senate Russell Office Building across the street when he noticed several police officers driving fast up Constitution Avenue on motorcycles.

Within seconds, he says, he heard 'three, four, five pops,' which he assumed were gunshots. He says police ordered him and nearby tourists to crouch behind a car for protection.

In about two minutes, he said, the officers moved everyone into the Capitol.

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