The ceremony at the World Trade Center site is the centerpiece of New York City's remembrances on the 10th anniversary of the Sept. 11 attacks, but other events throughout the city are marking the day.
A sunrise ceremony in Battery Park was showcasing poetry and musical performances. At Tribute Park in Queens, a piece of World Trade Center steel is being unveiled.
Later in the day, volunteers at Bryant Park are to record what visitors say they want the world to remember about Sept. 11 as part of an artist project.
Other events include peace walks, choral performances and candlelight vigils.
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