Sunday marks the 15th anniversary of Sept. 11 attacks, and Americans and many on Long Island will commemorate the somber occasion with moments of silence and memorials.

At Ground Zero in Manhattan, family members of victims of 2001 attack and the 1993 World Trade Center bombings will read aloud the names of their lost loved ones.

Hillary Clinton plans to arrive at the Sept. 11 memorial plaza at the World Trade Center site before the annual moment of silence at 8:46 a.m., marking the moment the first plane struck the north tower.

The ceremony will also pause to mark the time the second plane hit the south tower, the moment each tower collapsed, and the attacks on the Pentagon and aboard United Airlines Flight 93, which crashed near Shanksville, Pennsylvania.

A Trump campaign source told NBC News on Saturday the Republican presidential nominee planned to appear in lower Manhattan.

Close to 500 Long Islanders were among the nearly 3,000 people who perished in all of the attacks.

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A slew of events are planned across Long Island.

At sunrise, the Town of Hempstead will hold its annual memorial ceremony at Point Lookout. North Hempstead Town will hold its memorial service at Mary Jane Davies Green on Plandome Road in Manhasset at 8 a.m.

In Islip, first responders from local volunteer departments will lead a parade down Main Street to remember the more than 80 local residents who died in the terrorist attacks. The parade ends at the town’s Sept. 11 memorial. In Elmont, the Elmont Memorial Library will unveil a memorial featuring a steel beam from the trade center. The ceremony also celebrates the 10th anniversary of the current facility.

At 6:30 p.m., elected officials, clergy and Nassau residents will gather dockside at a Freeport marina on the Nautical Mile for a ceremony before boarding the Miss Freeport V for a memorial cruise.

The ceremony will include a 21-gun salute facing the direction of One World Trade Center at Ground Zero.

Other Long Island events include a worship service at Wantagh Memorial Congregational Church, a ceremony at the Village of Lynbrook’s Sept. 11 memorial park at Village Hall, and a memorial candle-lighting ceremony at Seaford High School.

On a little less somber note, Temple Sinai in Roslyn will be open to the community, offering activities such as pony rides, face painting and carnival games. Children will be able to decorate cookies and make cards and banners that will be given to local firefighters and police officers.

With AP