Security has been ramped up at the US Capitol in Washington in response to a possible plot to breach the building.

The move was prompted by intelligence that a militia group planned the attack for 4 March – the day conspiracy theorist group QAnon believes Donald Trump will return for a second term.

The House of Representatives cancelled Thursday’s session, but the Senate will continue with its agenda.

This latest threat comes barely two months after a riot at the capitol hill saw five people including a police officer killed and shook the foundations of American democracy.