Early this morning a bomb threat was phoned into the Tucson Sector Border Patrol Headquarters building.
According to BP officials, the call came in after 8:30 a.m. and forced the evacuation of the building.
The Swan gate of Davis-Monthan Air Force Base is currently closed to all traffic.
The Tucson Police Bomb Squad is currently on scene, and according to BP officials some employees have been let back into the building.
An investigation is still ongoing.
Stay with Tucson News Now for updates as they come in.
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