On Tuesday 11 September 2001, suicide attackers seized US passenger ... Citizens of 77 different countries were among the casualties. New York City lost 441 first responders.

Watch as the Bell of Hope rings at St Paul's Chapel in New York City to mark the exact moment when the first of two planes hit the World Trade Center Twin Towers on September 11, 2001. The bell ...

The National September 11 Memorial & Museum serves as the primary tribute to the nearly 3,000 victims of the 2001 terrorist attacks ... consider signing up for one of the city's best tours ...