Lockdown lifted after apparent airspace violation causes DC scare

The White House and U.S. Capitol building were briefly put on lockdown Tuesday morning after a possible unidentified aircraft or other "anomaly" violated restricted airspace over Washington, sources said. The incident caused an abrupt security situation, with jets being scrambled and officers warning people outside Capitol facilities to stay far away. The U.S. Secret Service said personnel at the White House were told to remain in place. -- More...