IN PHOTOS: Attacks on September 11, 2001
Americans on Tuesday will mark the 17th anniversary of the Sept. 11, 2001 terrorist attacks that claimed almost 3,000 lives.
President Donald Trump will attend a ceremony at the 9/11 memorial in Shanksville, Pennsylvania, near where United Airlines Flight 93 crashed after passengers retook control from the al-Qaida affiliated terrorists who had hijacked the plane.
