9/11 terror attacks reverberate as US marks 21st anniversary

President Joe Biden speaks 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/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A rose at the reflecting pool during the commemoration ceremony on the 21st anniversary of the September 11, 2001 terror attacks on Sunday, Sept. 11, 2022 in New York. (AP Photo/Stefan Jeremiah)

A visitor looks at the Wall of Names before a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

A man prays at the south pool during a ceremony Sunday at the National September 11 Memorial & Museum in New York. (AP Photo/Julia Nikhinson)

NEW YORK — Americans remembered 9/11 on Sunday with tear-choked tributes and pleas to “never forget,” 21 years after the deadliest terror attack on U.S. soil.