All 50 US states and the District of Columbia are on alert for possible violent protests this weekend,.
This is ahead of President-elect Joe Biden’s inauguration on Wednesday.
National Guard troops from across the country are being sent to Washington DC, to discourage any repeat of the deadly riot that unfolded on 6 January.
The FBI has warned of possible armed marches by pro-Trump demonstrators at all 50 state capitols.
The National Mall in DC has been shut.
Speaker of the United States House of Representatives Nancy Pelosi barricades are lining the streets of the capital amid tightened security.
The Biden team had already urged Americans to avoid travelling to the capital because of the Covid-19 pandemic, and local officials said people should watch the inauguration remotely.
Sunday is expected to be a particular focus for protests, after posts on pro-Trump and far-right online networks called for armed demonstrations on 17 January, and a march in Washington DC on inauguration day itself.
