U.S. Capitol buildings emptied

WASHINGTON, March 12 (UPI) -- Lawmakers, workers and visitors left several buildings in the U.S. Capitol complex Wednesday after a small airplane entered restricted air space, reports said.

The all-clear was given within the hour of the incident, CNN reported.

A Department of Homeland Security official said the Washington area was not under imminent threat but people were asked to leave voluntarily several buildings as a precaution. A formal evacuation was not issued, CNN said.

The small, private plane was traveling east and diverted, landing at an airport in Leesburg, Va., about 40 miles away from Washington. WJLA-TV, Leesburg, reported.