NEW YORK (AP) -- The Latest on the 18th anniversary of the Sept. 11, 2001, terror attacks (all times local):
  
9:55 a.m.
  
The ceremony is underway to remember the 40 passengers and crew who died after terrorists commandeered Flight 93 on Sept. 11, 2001.
  
Vice President Mike Pence is the keynote speaker at the Flight 93 National Memorial near Shanksville in western Pennsylvania.
  
The memorial marks the spot where the plane crashed in a rural area at 10:03 a.m. The San Francisco-bound plane had been diverted by the attackers toward Washington, D.C., when passengers heroically fought back.
  
The terrorists flew two planes into the World Trade Center skyscrapers in New York and a fourth into the Pentagon in Arlington, Virginia.
  
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9:45 a.m.
  
Loved ones are reading the names of those killed in the 9/11 terror attacks at a ceremony at ground zero.
  
Family members gathered Wednesday for the 18th anniversary of the attacks.
  
Memories of the victims are now being handed down through generations. A number of the readers were children who noted they had never met lost relatives - but said they loved them very much.
  
Joseph Henry says he was named after his uncle who was a firefighter, Joseph Patrick Henry. He says he wished he got to know his uncle and that he's "honored to be named after you."
  
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8:50 a.m.
  
Donald Trump is marking his third 9/11 anniversary as president with a moment of silence as his frustration grows over what he calls the "endless war" in Afghanistan, where al-Qaida conceived the attacks.
  
It has been 18 years since al-Qaida hijackers commandeered four U.S. commercial airliners and crashed them into the World Trade Center, the Pentagon and a field in Shanksville, Pennsylvania. Like Presidents Barack Obama and George W. Bush, Trump is marking the day with the war still raging.
  
Trump participated in a moment of silence Wednesday on the White House South Lawn with first lady Melania Trump and White House staff. He was going to the Pentagon afterward to honor the nearly 3,000 people who died in the largest attack on American soil.
  
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8:45 a.m.
  
The commemoration of the 18th anniversary of the Sept. 11 terror attacks has begun at ground zero with a moment of silence and tolling bells.
  
Victims' relatives and dignitaries were gathered on the memorial plaza at the World Trade Center in New York as the ceremony started at 8:46 a.m. Wednesday. That is the time when a hijacked plane slammed into the World Trade Center's north tower on Sept. 11, 2001.
  
Then victims' loved ones began reading the names of the nearly 3,000 people killed when a total of four hijacked planes crashed into the trade center, the Pentagon and a Pennsylvania field.
  
President Donald Trump is attending an observance at the Pentagon. Vice President Mike Pence is speaking at the 9/11 memorial near Shanksville, Pennsylvania.
  
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12 a.m.
  
Americans are commemorating 9/11 with mournful ceremonies, volunteering, appeals to "never forget" and rising attention to the terror attacks' extended toll on responders.
  
A crowd of victims' relatives is expected at ground zero Wednesday. President Donald Trump is scheduled to join an observance at the Pentagon.
  
Vice President Mike Pence is to speak at the third attack site, near Shanksville, Pennsylvania.
  
Eighteen years after the deadliest terror attack on American soil, the nation is still grappling with the aftermath at ground zero, in Congress and beyond.
  
The attacks' aftermath is visible from airport security checkpoints to Afghanistan, where a post-9/11 invasion has become America's longest war.
  
Nearly 3,000 people were killed when hijacked planes rammed into the World Trade Center, the Pentagon and a Shanksville field on Sept. 11, 2001.

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