A look at events in New York City, Washington and Shanksville, Pa., marking the 12th anniversary of the Sept. 11 attacks:

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A look at events in New York City, Washington and Shanksville, Pa., marking the 12th anniversary of the Sept. 11 attacks:

NEW YORK CITY

The commemoration will take place at the National Sept. 11 Memorial & Museum plaza at the World Trade Center site. Families of victims in the 1993 and 2001 attacks will read the names of those who died, interspersed with moments of silence:

– 8:46 a.m.: Moment of silence to mark Flight 11 hitting the north tower. Houses of worship have been asked to toll their bells.

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– 9:03 a.m.: Moment of silence to mark Flight 175 hitting the south tower.

– 9:37 a.m.: Moment of silence to mark Flight 77 hitting the Pentagon.

– 9:59 a.m.: Moment of silence to mark the fall of the south tower.

– 10:03 a.m.: Moment of silence to mark the crashing of Flight 93 near Shanksville, Pa.

– 10:28 a.m.: Moment of silence to mark the fall of the north tower.

– 12:30 p.m.: Scheduled conclusion of ceremony.

WASHINGTON

Commemoration ceremonies with victims’ families and survivors will be held at 9:30 a.m. at the Pentagon Sept. 11 Memorial in Arlington, Va.

– 9:30 a.m.: Ceremony begins and will include a wreath laying.

– 9:37 a.m.: Moment of silence marking Flight 77 hitting the Pentagon.

– 1 p.m.: Pentagon employees for an event in the courtyard.

PENNSYLVANIA

– 10:03 a.m.: Bells will be rung and names of passengers and crew members will be read at the Flight 93 National Memorial.

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