Police cleared the last of the supporters of Donald Trump from the US Capitol after they stormed the building and disrupted the certification by Congress of Democrat Joe Biden’s election victory.

US media outlets quoted the sergeants-at-arms of the House of Representatives and the Senate as saying the Capitol was now secure, about four hours after it first came under attack.

A dusk-to-dawn curfew has been declared by Washington Mayor Muriel Bowser, who asked for the assistance of the National Guard to help reestablish order in the nation"s capital.

The curfew went into force at 6.00pm (0100 GMT) but thousands of Trump supporters could still be seen milling about the streets.