Security was increased at the US Capitol in response to "Plans that are possible to violate" the building.

The move was alerted by intelligence agencies that anonymous militants had planned the March 4 attack, the day the U.S. president took office.

The House of Representatives canceled a meeting on Thursday. But the Senate will continue with the agenda.

The threat comes two months after an attack on the building by a mob loyal to former President Donald Trump.

They breached the House of Commons in January as lawmakers were moving to ensure Democrat Joe Biden's election victory. Trump refused to admit he had lost the election.

The riots killed five people, including a police officer, and shook the foundations of American democracy. The chief of the state police later resigned.

Proponents of unfounded conspiracy theories believe Mr Trump will return to the White House on March 4.

Why are QAnon believers obsessed with March 4th?

"In late February, an unidentified violent extremist group discussed plans to take control of the US government and remove Democratic lawmakers on or around March 4 and discuss plans to take control of the US government and remove Democratic lawmakers on or around March 4. With plans that inspired  เกมยิงปลา thousands of people to travel to Washington, D.C. to join. The new intelligence statements released by the FBI and the Department of Homeland Security said.

After this assessment, the US state police cited in a statement: "Plans as possible to violate government entities by volunteer groups identified on Thursday March 4"

“We have made significant security upgrades to include building physical structures and manpower to ensure protection from Congress, our citizens and the police.

"Due to the sensitive nature of this information we are unable to provide further details at this time."