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The official ceremony to mark the 11th anniversary of the 9/11 attacks will take place at the National September 11 Memorial on Tuesday.
The program begins at 8:39 a.m., with bagpipers and drummers leading the World Trade Center flag through the memorial to the stage. The Young People's Chorus of New York City will perform the national anthem.
8:46 a.m. -- Moment of silence marking the time that the first plane struck the north tower. Houses of worship throughout the city will toll their bells, and the reading of the names will begin. One hundred pairs of family members will read the names.
At the same time, New York City police officers throughout the five boroughs who are not responding to calls for service will form in front of their respective command, at which time the names of the 23 members of the NYPD who were killed in the line of duty on Sept. 11 will be read.
9:03 a.m. -- Moment of silence marking the time the second plane struck the south tower. Then, the reading of the names resumes, along with background music.
9:37 a.m. -- Moment of silence marking the time Flight 77 struck the Pentagon. The reading of the names continues.
9:59 a.m. -- Moment of silence marking the moment the south tower fell. The reading of the names resumes.
10:03 a.m. -- Moment of silence marking the crash of Flight 93 near Shanksville, Pa. Name-reading continues.
10:28 a.m. -- Moment of silence marks the time the north tower fell. Family members continue reading names. Young People's Chorus of New York City performs "Give Us Hope," and Taps will be performed by trumpeters from the NYPD, FDNY and Port Authority.
12:30 p.m. -- Program concludes.
The following is a list of streets in the area of lower Manhattan that will be impacted by the events surrounding the annual September 11th Memorial Ceremony:
The following streets will be closed to traffic from 12:01 AM until 5:00 PM Tuesday, September 11, 2012 (subject to change). Pedestrian access will be very limited: