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Capitol put on lockdown after fire reported several blocks away

The Capitol complex was briefly locked down on Monday due to an "external security threat," U.S. Capitol Police said, after a fire was reported several blocks away under a nearby bridge.

An email alert sent out to lawmakers shortly before 10:30 a.m. said that there was no entry or exit from the complex. Those inside the buildings were instructed to stay away from exterior windows and doors. Those outside were ordered to “seek cover.”

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The lockdown went into effect as a rehearsal for President-elect Joe BidenJoe BidenNoem touts South Dakota coronavirus response, knocks lockdowns in CPAC speech On The Trail: Cuomo and Newsom — a story of two embattled governors Biden celebrates vaccine approval but warns 'current improvement could reverse' MORE’s Wednesday inauguration was underway, forcing people to be evacuated from the Capitol’s West Front and back into the building out of an abundance of caution.

Nearby reporters noted that smoke could be seen rising in the distance behind the Capitol.

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A law enforcement official told NBC News that what turned out to be a fire at a homeless encampment prompted the security alert.

The D.C. Fire Department noted that a nearby fire was extinguished on the 100 block of H Street SE. No injuries were reported. 

Vito Maggiolo, a public information officer with D.C. Fire, told CNN that the fire was "very minimal" and it was "pretty much a non-incident.”

The Capitol is currently operating as a military zone ahead of Biden’s inauguration this week, as law enforcement ramped up security after a pro-Trump mob overwhelmed police to storm the building on Jan. 6, an attack that resulted in five deaths.

President TrumpDonald TrumpNoem touts South Dakota coronavirus response, knocks lockdowns in CPAC speech On The Trail: Cuomo and Newsom — a story of two embattled governors McCarthy: 'I would bet my house' GOP takes back lower chamber in 2022 MORE was impeached by the House last week on a charge of inciting an insurrection at the Capitol. 

There are currently 7-foot barriers that have been staged around the Capitol, its office buildings and the Supreme Court. The National Mall is temporarily closed to public access in the days leading up to and following the inauguration on Jan. 20. 

Roughly 25,000 National Guard troops are deployed to D.C. in order to boost security around the inauguration. Biden, Trump, Vice President Pence and lawmakers have been briefed on potential threats to the inauguration. Biden will be sworn in outdoors at the Capitol on Wednesday in a ceremony that has been scaled-down for health safety reasons during the coronavirus pandemic. 

Morgan Chalfant contributed.