The US Capitol Complex has been put in lockdown with no entry or exit due to an “external security threat”.
US Capitol Police issued a warning to all buildings within the complex.
A notice sent to House and Senate offices read: “All buildings within the Capitol Complex: Due to an external security threat located under the bridge on I-295 at First and F Streets SE, no entry or exit is permitted at this time.
“You may move throughout the buildings but stay away from exterior windows and doors.
“If you are outside, seek cover.”
TheCapitol Complex on the National Mall in Washington DC,is a group of 20 buildings and offices surrounding the Capitol building itself, that are used by elected officials, the federal government and its departments.
Earlier this month protesters stormed the Capitol building leaving five people dead – including a woman who was shot by police inside the building – and caused widespread shock and outrage in America.
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Since the riot, there has been a tense atmosphere in the city, which on Wednesday hosts the inauguration of president-elect Joe Biden and his vice president Kamala Harris.
Former FBI boss James Comey has warned he is worried about the threat of violence from “armed, disturbed people” at the inauguration.
Biden inauguration: Watch and follow events on Sky News from 1pm on Wednesday, with the ceremony starting at 4pm