"This is a beautiful moment": A group of firefighters hiked one mile up Georgia's Stone Mountain, the equivalent to climbing 160 flights of stairs, in memory of those killed in the 9/11 attacks.
New Zealand firefighters performed a haka, a type of ancient war dance, to pay tribute to the first responders who died in the line of duty on September 11. They then climbed the stairs of the Sky Tower in memory of their American counterparts.
Former Pres. George W. Bush places a wreath of white flowers at the Pentagon, and participates in a moment of silence with former Defense Sec. Donald Rumsfeld on the 18th anniversary of the 9/11 terror attacks.
Pres. Trump remembers the World Trade Center attacks on 9/11: "It was then that I realized the world was going to change...It could never, ever be that innocent place that I thought it was." #NeverForget
Pres. Trump on anniversary of 9/11: "We do not seek conflict—but if anyone dares to strike our land, we will respond with the full measure of American power and the iron will of the American spirit." #NeverForget