In a sign of the level of alert around the Capitol building ahead of the Wednesday's inauguration, US Capitol Police have told people inside to stay inside, away from windows and to not leave due to an exterior security threat.
The alert at the Capitol appears to be related to an incident that occurred near the Capitol building.
DC Fire's Vito Maggiolo says the incident involved a small fire involving tent that is now out.
DC fire was dispatched at 10:14 a.m. ET and the fire was put out a few minutes ago. He said the response was "very minimal" and it was "pretty much a non-incident."
CNN is told that they are evacuating the West front of the Capitol and the 1st floor crypt.
"I just tried to leave Longworth after getting my Covid test, only to be told that the building is now on lockdown. Apparently some external threat. Propane tanks under some bridge. Stuck in my office," a Democratic congressman told CNN.
DC Fire and EMS tweeted moments ago about the incident, saying there have been no injuries related to the fire.
CNN's Manu Raju reports: