The United States commemorates the 15th anniversary of the 9/11 attacks with a moment of silence observed in somber remembrance at Ground Zero in New York, where nearly 3,000 people were killed. Saint Paul's Chapel situated directly across from the World Trade Center and which served as a relief mission for the rescue and recovery workers at Ground Zero, rang its Bell of Hope in the traditional firefighters' salute to the fallen at precisely the time of the first plane crash into the North Tower..