Ceremonies are being held to mark the 25th anniversary of the attacks on America. Nearly 3,000 people were killed on that day, and thousands more have died as a result over the past quarter-century.

These ceremonies are taking place nationwide, including at significant sites. The events are expected to include memorial rituals such as wreath-laying and moments of silence.

Further details about these ceremonies and the anniversary are available, including information about the events at Ground Zero, the Pentagon, and Shanksville, Pennsylvania.