Officials say evacuation at the inaugural rehearsal was due to a fire several blocks away and not believed to be a threat.
The fire is reportedly under the bridge on I-295 at First and F Streets SE, and no entry or exit into the Capitol Complex is permitted at this time.
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People can move throughout the buildings but have been told to stay away from exterior windows and doors.
NBC News reports this was related to a fire at an encampment by people experiencing homelessness.