A military alarm sounded in Washington, smoke rose above the Capitol building.
Reuters reports that the building is blocked, all entrances and exits are closed due to an "external security threat".
NBC News correspondent Frank Thorpe reported that part of the parliamentary complex was evacuated. Including the evacuation of some National Guardsmen.
However, as it turned out, there was a small fire nearby, which happened not far from the Capitol: under the bridge where the homeless live.