News Summary from CNN
-- Sources tell CNN one of two planes that crashed into World Trade Center was an American Airlines 767.
-- President Bush calls plane crashes at World Trade Center a terrorist act.
-- White House evacuated.
-- Fire reported on National Mall in Washington.
-- CNN confirms a plane hit the Pentagon.
-- Significant fire at the Pentagon.
-- One of World Trade Center towers collapses; fire forces evacuation of State Department.
-- United Nations evacuated.
-- Car bombing at the State Department, The Associated Press reports.
-- Pentagon monitoring second suspected hijacked plane.
-- Fighter scrambled amid reports of second plane headed for Pentagon.
-- FAA diverting all U.S.-bound international flights to Canada.
-- Part of Pentagon collapses.
-- Second World Trade Center tower collapses in Manhattan.
-- NTSB confirms plane crashes near Pittsburgh.