New Delhi, Sept. 11 -- Americans are marking 24 years since the September 11, 2001, terror attacks with ceremonies, volunteer work, and moments of silence. Families of victims, survivors, political leaders, and ordinary citizens are gathering in New York, at the Pentagon in Virginia, and in Shanksville, Pennsylvania, to honor the nearly 3,000 people killed that day.

Loved ones of those lost continue to carry their grief. "Even 24 years later, it's heart wrenching," said Jennifer Nilsen, whose husband Troy worked at Cantor Fitzgerald on the 103rd floor of the World Trade Center. "It feels the same way every year."

At Ground Zero in Lower Manhattan, relatives will again read aloud the names of the victims. Moments of silence will mark the...