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.

<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>
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.
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)
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)
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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