8:55 a.m.
Hillary Clinton and Donald Trump are attending the Sept. 11 remembrance ceremony in New York.
The presidential candidates greeted supporters on Sunday as they entered the downtown Manhattan memorial. They're not expected to make public remarks at the event, and both have promised to suspend campaign activities to mark the 15th anniversary of the attacks.
Clinton — a former New York senator — has frequently highlighted her efforts, including in a campaign ad released Friday, to aid those affected by the World Trade Center collapse.
Trump — a New York real estate mogul — has said he donated construction equipment to the recovery effort and gave $100,000 to the memorial after touring it for the first time earlier this year.
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8:46 a.m.
The commemoration of the 15th anniversary of 9/11 has begun at ground zero.
Sunday's ceremony began with a moment of silence and tolling bells at 8:46 a.m., the time when a terrorist-piloted plane slammed into the World Trade Center's north tower.
After the silent period, victims' relatives began reading the names of the nearly 3,000 people killed when four hijacked aircraft hit the trade center, the Pentagon and a Pennsylvania field. It was the deadliest terror attack on American soil.
President Barack Obama will speak at an observance at the Pentagon. Hundreds of people also are expected at a ceremony at the Flight 93 National Memorial in Shanksville, Pennsylvania.
Democratic presidential nominee Hillary Clinton and Republican rival Donald Trump are attending the anniversary ceremony at the World Trade Center.
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8:20 a.m.
Family members of those lost on Sept. 11 are arriving at ground zero for the ceremony marking the 15th anniversary of the attacks.
Some are going into National September 11 Museum, which is open only to victims' families until Sunday afternoon, when the public will be allowed to enter.
About an hour before the official commemoration start, police officers in uniform and bagpipers rehearsed part of the ceremony involving a display of the US flag.
As it has every year, the remembrance will mainly focus on the reading of the names of those killed in the attacks. It will also include moments of silence and the tolling of bells.
Other ceremonies are being held at the Pentagon and at the Flight 93 National Memorial in Shanksville, Pennsylvania.
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12:20 a.m.
Relatives and loved ones of 9/11 victims will convene Sunday to mark the 15th anniversary of the terror attacks.
Organizers have planned some additional music and readings to mark the milestone anniversary at ground zero.
But they are keeping traditions that have made the ceremony a constant in how America remembers Sept. 11, even as ground zero and the nation changes.
The customs include moments of silence and tolling bells, an apolitical atmosphere and the reading of the nearly 3,000 names of those killed in New York, at the Pentagon and near Shanksville, Pennsylvania.
President Barack Obama will speak at an observance at the Pentagon. Hundreds of people also are expected at a ceremony at the Flight 93 National Memorial in Shanksville.
AP
