U.S. raises national aviation terrorism alert to orange after man tries to blow up passenger plane over Detroit.
UPDATE: Passenger lights firecrackers as Northwest Airlines flight lands in Detroit; minor injuries reported.
UPDATE2: Airport security has been heightened all over the country due to a small explosion aboard a Delta Airlines flight headed to Detroit this afternoon. A senior administration official tells ABC News that “this was an attempted act of terrorism. We’re taking increased steps to mitigate any threats.