The US Federal Bureau of Investigation is warning of possible armed protests in all 50 states and Washington D.C. in the run-up to President-elect Joe Biden's inauguration on January 20.
US media reported on Monday that an internal FBI bulletin tells relevant authorities that armed protests are being planned from January 16 through 20, when Biden will be sworn in as President.
The reports say the FBI has also been informed about an armed group that is warning of "a huge uprising," if President Donald Trump is removed from office before his term ends.
Tension is mounting in Washington following the violent siege of the Capitol building last Wednesday by Trump supporters.
Metal fences more than two meters high have been erected near the inauguration site. Around 10,000 members of the National Guard will be mobilized in the capital by the end of this week.
The mayor of Washington D.C. and the state governors of neighboring Maryland and Virginia have issued a joint statement pledging to work with the federal government to ensure public safety.
They are urging people not to visit Washington for the inauguration, calling on them to instead participate virtually.