The US Capitol complex in Washington, DC, temporarily locked down on Monday during the rehearsal for President-elect Joe Biden’s inauguration after a fire from beneath a bridge about 1.6 kilometres (one mile) away sent a plume of smoke into the air and caused security concerns.
But law enforcement officials said there was no threat to the public and the fire was not believed to be a threat to the inauguration
The evacuation of some participants and the lockdown were ordered by the acting chief of Capitol Police in an abundance of caution, officials said.
Biden was not participating in the rehearsal.
The riot on January 6 at the US Capitol by pro-Trump supporters has prompted anxiety and many security concerns about the inauguration.
The US Secret Service increased security in and around the Capitol a week early in preparation, and the city centre is essentially on lockdown with streets blocked, high fencing installed and tens of thousands of National Guard and other law enforcement officers stationed around the area.
Participants were ushered from the West Front of the Capitol. Those who had gathered for a walk-through, including a military band, were directed to head indoors and moved in the direction of a secure location inside the Capitol complex.
The fire department later tweeted that no one was injured and that the smoke was coming from a nearby fire caused by a homeless woman using propane inside her tent on H Street South East.