PHOTOS: September 11th Remembrance Ceremonies

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Sunday, September 11, 2016
  • A visitor pays tribute to the passengers and crew of Flight 93 at the Flight 93 National Memorial in Shanksville, Pa, Sunday, Sept. 11, 2016.
  • Mourners hold photos of their loved ones during the 15th anniversary of the attacks of the World Trade Center at the National September 11 Memorial, Sunday, Sept. 11, 2016.
  • Democratic presidential candidate Hillary Clinton arrives to attend a ceremony at the National September 11 Memorial, in New York, Sunday, Sept. 11, 2016.
  • A mourner holds a photo of her loved one during the 15th anniversary of the attacks of the World Trade Center at the National September 11 Memorial, Sunday, Sept. 11, 2016.
  • Mourners hold a photo of their loved one during the 15th anniversary of the attacks of the World Trade Center at the National September 11 Memorial, Sunday, Sept. 11, 2016.
  • A mourner holds a photo of their loved one during the 15th anniversary of the attacks of the World Trade Center at the National September 11 Memorial, Sunday, Sept. 11, 2016.
  • Republican presidential candidate Donald Trump, left, speaks with New Jersey Gov. Chris Christie, right, as he attends a ceremony at the Sept. 11 memorial.
  • September 11th Remembrance Ceremony
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  • Republican presidential candidate Donald Trump, center, attends a ceremony at the Sept. 11 memorial, in New York, Sunday, Sept. 11, 2016.
  • President Barak Obama bows his head for a moment of silence before delivering remarks at the Sept. 11 memorial observance ceremony at the Pentagon, Sunday, Sept. 11, 2016.
  • A couple hugs while sitting in the Pentagon Memorial prior to a Sept. 11 observance ceremony at the Pentagon, Sunday, Sept. 11, 2016.
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A visitor pays tribute to the passengers and crew of Flight 93 at the Flight 93 National Memorial in Shanksville, Pa, Sunday, Sept. 11, 2016.
AP Photo/Jared Wickerham

The U.S. marked the 15th anniversary of 9/11 on Sunday, with victims' relatives reading their names and reflecting on a loss that still felt as immediate to them as it was indelible for the nation.