For a few minutes earlier today, President Bush retreated to an underground shelter and tourists were evacuated from the White House's East Wing. Says press secretary Scott McClellan: "There was an indication that an aircraft has entered the no-fly zone. There's an investigation to determine what it really was." Air America promotional balloon maybe? — GREG BEATO

False alarm sends President Bush to underground shelter [AP]

Air America Under Investigation By Secret Service [Billboard Radio Monitor]