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
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
September 11th Remembrance Ceremony
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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PHOTOS: September 11th Remembrance CeremoniesA 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.