PHOTOS: 9/11 memorialized 21 years later

Sunday marked the 21-year anniversary of the deadly terrorist attacks in America on Sept. 11. Memorial services were held in New York City, at the Pentagon and in a field near Shanksville, Pennsylvania, where Americans remembered the nearly 3,000 lives taken on that tragic day.

See photos of the 9/11 memorials and remembrances held Sunday.

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A general view of campers during the Comfort Zone Camp New Jersey on Sept. 11, 2022 in Hardwick, New Jersey, United States. (Photo by Bennett Raglin/Getty Images for Comfort Zone Camp)

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A general view of campers during the Comfort Zone Camp New Jersey on Sept. 11, 2022 in Hardwick, New Jersey, United States. (Photo by Bennett Raglin/Getty Images for Comfort Zone Camp)

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Sailors from the USS Somerset walk to the memorial stone placed at the crash site during a ceremony commemorating the 21st anniversary of the crash of Flight 93 during the September 11th terrorist attacks at the Flight 93 National Memorial on Sept. 11, 2022 in Shanksville, Pennsylvania. The nation is marking the twenty-first anniversary of the terror attacks of Sept. 11, 2001, when the terrorist group al-Qaida flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. (Photo by Jeff Swensen/Getty Images)

<p>NEW YORK, NEW YORK – SEPTEMBER 11: Flags and flowers adorn the names of the victims of the attacks of Sept. 11, 2001, during a ceremony at the 9/11 Memorial and Museum on September 11, 2021 in New York City. The nation is marking the 20th anniversary of the terror attacks of September 11, 2001, when the terrorist group al-Qaeda flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. (Photo by Craig Ruttle-Pool/Getty Images)</p>

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Flags and flowers adorn the names of the victims of the attacks of Sept. 11, 2001, during a ceremony at the 9/11 Memorial and Museum on Sept. 11, 2021 in New York City. The nation is marking the 20th anniversary of the terror attacks of Sept. 11, 2001, when the terrorist group al-Qaida flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. (Photo by Craig Ruttle-Pool/Getty Images)

<p>NEW YORK, NEW YORK – SEPTEMBER 11: Flags and flowers adorn the names of the victims of the attacks of Sept. 11, 2001, during a ceremony at the 9/11 Memorial and Museum on September 11, 2021 in New York City. The nation is marking the 20th anniversary of the terror attacks of September 11, 2001, when the terrorist group al-Qaeda flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. (Photo by Craig Ruttle-Pool/Getty Images)</p>

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Teams around the NFL tweeted messages honoring the victims, survivors and first responders of the 9/11 terrorist attacks, including a particularly emotional national anthem at MetLife Stadium as the Jets hosted the Ravens.

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A detail of a base in remembrance of 9/11 during the fourth inning of a game between the Arizona Diamondbacks and Colorado Rockies at Coors Field on Sept. 11, 2022 in Denver, Colorado. (Photo by Justin Edmonds/Getty Images)

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Members of the Cleveland Guardians and Minnesota Twins stand for the national anthem during the ceremony to commemorate the 21st anniversary of the September 11th terrorist attacks before the start of the game at Target Field on Sept. 11, 2022 in Minneapolis, Minnesota. (Photo by Matt Krohn/Getty Images)

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A detail of a 9/11 remembrance ribbon on the helmet of Matt Ryan #2 of the Indianapolis Colts during the game against the Houston Texans at NRG Stadium on Sept. 11, 2022 in Houston, Texas. (Photo by Carmen Mandato/Getty Images)

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U.S. President Joe Biden participates in a wreath-laying ceremony at the National 9/11 Pentagon Memorial on Sept. 11, 2022 in Arlington, Virginia. The nation is marking the twenty-first anniversary of the terror attacks of Sept. 11, 2001, when the terrorist group al-Qaida flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. (Photo by Anna Moneymaker/Getty Images)

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U.S. Defense Secretary Lloyd Austin speaks during a remembrance ceremony to mark the 21st anniversary of the 9/11 attacks, at the Pentagon in Washington, D.C., on Sept. 11, 2022. (Photo by ROBERTO SCHMIDT / AFP) (Photo by ROBERTO SCHMIDT/AFP via Getty Images)

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The family of FDNY paramedic Carlos “Rey” Lillo pose for a photo during the annual 9/11 Commemoration Ceremony at the National 9/11 Memorial and Museum on Sept. 11, 2022 in New York City. This year marks the 21st anniversary of the terror attacks of Sept. 11, 2001, when the terrorist group al-Qaida flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. Vice President Kamala Harris and Secretary of Homeland Security Investigations Alejandro N. Mayorkas were in attendance for this year’s ceremony. (Photo by Michael M. Santiago/Getty Images)

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The family of the victims of the 9/11 terror attack listen as their names are read during the annual 9/11 Commemoration Ceremony at the National 9/11 Memorial and Museum on Sept. 11, 2022 in New York City. This year marks the 21st anniversary of the terror attacks of Sept. 11, 2001, when the terrorist group al-Qaida flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. Vice President Kamala Harris and Secretary of Homeland Security Investigations Alejandro N. Mayorkas were in attendance for this year’s ceremony. (Photo by Michael M. Santiago/Getty Images)

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Fans watch pregame ceremonies before an NFL football game between the New York Jets and the Baltimore Ravens Sunday, Sept. 11, 2022, in East Rutherford, N.J. (AP Photo/John Munson)

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Former President George W. Bush gives a thumbs-up after the first pitch to recognize the 21st anniversary of Patriot Day before a baseball game between the Toronto Blue Jays and the Texas Rangers in Arlington, Texas, Sunday, Sept. 11, 2022. (AP Photo/LM Otero)

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Crowds gather outside of O’Hara’s in an attempt to witness the ceremony to commemorate the 21st anniversary of the Sept. 11 attacks, Sunday, Sept. 11, 2022, at the National September 11 Memorial & Museum in New York. (AP Photo/Julia Nikhinson)

A firefighter salutes outside the FDNY Engine 10, Ladder 10 fire station near the commemoration ceremony on the 21st anniversary of the September 11, 2001, terror attacks on Sunday, Sept. 11, 2022, in New York. (AP Photo/Julia Nikhinson)

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A firefighter salutes outside the FDNY Engine 10, Ladder 10 fire station near the commemoration ceremony on the 21st anniversary of the Sept. 11, 2001, terror attacks on Sunday, Sept. 11, 2022, in New York. (AP Photo/Julia Nikhinson)

A firefighter salutes outside the FDNY Engine 10, Ladder 10 fire station near the commemoration ceremony on the 21st anniversary of the September 11, 2001, terror attacks on Sunday, Sept. 11, 2022, in New York. (AP Photo/Julia Nikhinson)

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Flowers and flags on the south pool commemorate the 21st anniversary of the Sept. 11 attacks, Sunday, Sept. 11, 2022, at the National September 11 Memorial & Museum in New York. (AP Photo/Julia Nikhinson)

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A general view of campers in a healing circle during the Comfort Zone Camp New Jersey on Sept. 11, 2022 in Hardwick, New Jersey, United States. (Photo by Bennett Raglin/Getty Images for Comfort Zone Camp)

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A bell is rung during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

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Firefighters stand in line during a moment of silence near the 9/11 Memorial in New York City, on Sept. 11, 2022, on the 21st anniversary of the attacks on the World Trade Center, Pentagon, and Shanksville, Pennsylvania. (Photo by Yuki IWAMURA / AFP) (Photo by YUKI IWAMURA/AFP via Getty Images)

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People embrace at the 9/11 Memorial in New York City, on Sept. 11, 2022, on the 21st anniversary of the attacks on the World Trade Center, Pentagon, and Shanksville, Pennsylvania. (Photo by Yuki IWAMURA / AFP) (Photo by YUKI IWAMURA/AFP via Getty Images)

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A Montgomery County deputy salutes the flags during a September 11th Observance ceremony on the 21st anniversary of the 9/11 attacks, held at the Montgomery County Veterans Memorial Park Sunday, Sept. 11, 2022 in Conroe, Texas. (Michael Wyke/Houston Chronicle via AP)

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Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

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A person riding an e-bike with an American flag outside the Oculus on the 21st anniversary of the Sept. 11, 2001 terror attacks on Sunday, Sept. 11, 2022 in New York. (AP Photo/Stefan Jeremiah)

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A group of family members take a photo together before President Joe Biden arrives for a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)