Watch: Third and fourth moment of silence in NYC and timeline of 9/11 attacks

By CBS News

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At 9:59 a.m. ET on Sept. 11, 2001, the South Tower collapsed at the World Trade Center in New York City during a series of terrorist attacks that changed the U.S. forever. At 10:03 a.m. ET, the passengers on United Airlines Flight 93 launched a counterattack on the hijackers aboard their plane, causing a crash into a field near Shanksville, Pennsylvania. It's believed the aircraft may have been headed toward Washington, D.C. CBS News 24/7 is the premier anchored streaming news service from CBS News and Stations that is available free to everyone with access to the internet and is the destination for breaking news, live events, original reporting and storytelling, and programs from CBS News and Stations' top anchors and correspondents working locally, nationally and around the globe. It is available on more than 30 platforms across mobile, desktop and connected TVs for free, as well as CBSNews.com and Paramount+ and live in 91 countries. Subscribe to the CBS News YouTube channel: http

Tags: 9/11, Remembering 9/11, nyc, New York City, World Trade Center, September 11, CBS News 24-7 Clips, U.S., Politics