The United States marks 22 years since 9/11, from ground zero to Alaska

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FILE An American flag is unfurled at the Pentagon, in Washington, Sept. 11, 2021, at sunrise on the morning of the 20th anniversary of the terrorist attacks. Americans are looking back on the horror and legacy of 9/11, gathering Monday, Sept. 11, 2023, at memorials, firehouses, city halls and elsewhere to observe the 22nd anniversary of the deadliest terror attack on U.S. soil. (AP Photo/Alex Brandon)