Days after rioters breached the US Capitol in a deadly attack that stunned the world, cities around the country were girding for a potential new wave of violent protests over the weekend, erecting barriers and deploying thousands of National Guard troops.

The FBI warned police agencies of possible armed demonstrations outside all 50 state capitol buildings starting Saturday through President-elect Joe Biden's inauguration on Jan. 20, fueled by supporters of President Donald Trump who believe his false claims of electoral fraud.