ROUGH CUT. NO REPORTER NARRATION.
U.S. President Barack Obama delivered a blessing as official ceremonies marking the attacks of September 11, 2001 began in New York.
Americans on Sunday remembered the horror of Sept. 11, 2001, and the nearly 3,000 people who died in the hijacked plane attacks.
Obama will travel to all three sites on Sunday where hijackers turned planes into missiles, bringing down the twin towers of the World Trade Center in New York, hitting the Pentagon in Virginia and crashing into a Pennsylvania field.
