New York City Commemorates 20th Anniversary Of 9/11 Terror Attacks NEW YORK, NEW YORK - SEPTEMBER 11: A member of the FDNY visits the reflecting pool during a ceremony at the National September 11 Memorial & Museum commemorating the 20th anniversary of the September 11th terrorist attacks on the World Trade Center 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 Mike Segar-Pool/Getty Images) (MIKE SEGAR/Getty Images)