All 50 US states and the District of Columbia (DC) are on alert for possible violent protests this weekend, ahead of President-elect Joe Biden’s inauguration on Wednesday.
National Guard troops have been sent to Washington DC, to deter any repeat of last week’s deadly riots.
The FBI has warned of possible armed marches by pro-Trump supporters at all 50 state capitols.
In DC, Capitol Police arrested an armed man at a security checkpoint.
Police confirmed on Saturday that a Virginia man had been arrested a day earlier with two handguns and 509 rounds of ammunition, as he tried to access a restricted area near the Capitol in a pick-up truck.
He was carrying a “non-government issued credential”, police said.
Responding on Twitter, Representative Don Beyer of Virginia said “the danger is real”, and urged people to avoid the Capitol area.The BBC is not responsible for the content of external sites.