Twenty-four years after Sept. 11, 2001, Americans remember the nearly 3,000 lives in the terror attacks at the World Trade Center in lower Manhattan, at the Pentagon and in Shanksville, Pennsylvania.
The remembrances are being held during a time of increased political tensions. The 9/11 anniversary, often promoted as a day of national unity, comes a day after conservative activist Charlie Kirk was shot and killed while speaking at a college in Utah. Follow along for live updates.