An officer from the NYPD pauses at the National September 11 Memorial & Museum, ahead of the ceremony marking the 22nd anniversary of the September 11, 2001 attacks on the World Trade Center, in New York City, U.S., September 11, 2023. Monday marks the 22nd anniversary of the 9/11 terror attacks — the deadliest such attack on U.S. soil — which took the lives of nearly 3,000 people. A group of 19 terrorists tied to the Islamic extremist group al-Qaida targeted New York and Washington, D.C. with hijacked planes. Over 400 first responders were killed in the aftermath of the collapse of the Twin Towers at the World Trade Center. Here's a look at how the country is commemorating the tragic day.

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Organizations: & Museum, World Trade Center, World Trade, Pentagon Locations: New York City, U.S, York, Washington, Shanksville, Pa