Live Updates: Extraordinary security measures in place nationwide ahead of inauguration of Joe Biden - CBS News

A stepped up security presence is also assembling at state capitols nationwide.

The FBI has warned of possible armed protests at all 50 state capitols.

The Department of Homeland Security issued a new intelligence briefing that domestic extremists pose the highest threat to Biden's inauguration, a U.S.

The bulletin warns of violence against federal buildings, and according to one official, it says there are "continued opportunities for violence targeting public officials, government buildings, and federal and local law enforcement.".

The Homeland Security bulletin was issued on Thursday, the same day that FBI Director Chris Wray said the agency is tracking an "extensive amount of concerning online chatter.".

All federal prisons in the United States have been placed on lockdown, with officials aiming to quell any potential violence that could arise behind bars as law enforcement prepares for potentially violent protests across the country.

The lockdown decision is precautionary, no specific information led to it and it is not in response to any significant events occurring inside facilities, the bureau said.

Businesses around Capitol Hill in Denver aren't taking any chances leading up to Inauguration Day after last week's protest at the state Capitol.

Down the street, Capitol Hill Books, just un-boarded itsr windows after eight months of having them blocked off due to protests in the city.

With reports of armed protests at all 50 state capitols, Denver businesses say the best plan of action is to be prepared.

Officials this weekend are concerned about armed protesters at the Minnesota State Capitol.

The Department of Public Safety said Minnesota State Patrol troopers will be visible and available to respond this weekend, as will National Guard soldiers, after they were activated Wednesday.

Both the FBI and Department of Homeland Security have made it clear to Minnesota officials there's no immediate credible threat in the state.

A group that has been planning since November to have armed rallies in Washington, D.C., as well as state capitols, intends to carry out its events Sunday, despite an unprecedented effort to secure the Capitol.

The FBI warned law enforcement this week about a group calling for its supporters to come to Washington, D.C., and state capitols armed at their "personal discretion.".

The online flyer posted that day noted that the "Armed march on Capitol Hill and all state capitols" was planned for January 17 and was intended to be peaceful, but encouraged participants to "come armed at your personal discretion." In a follow-up posted four days after rioters breached the Capitol — including some who prosecutors now say were intent on harming the Vice-President and other elected officials — the group wrote that its protest was in "pending status given the events that have taken place." .

Capitol or any state capitol buildings until after Inauguration Day. 

"We're monitoring for signals of violence or other threats both in Washington, D.C

as we did in the weeks after the presidential election, we are promoting accurate information about the election and the violence at the Capitol instead of content that our systems predict may be less accurate, delegitimizes the election or portrays the rioters as victims."