9/11 quotes, Sept. 11 -- On September 11, 2001, the world witnessed a tragedy unlike any other: the 9/11 terror attacks. The attacks on the Twin Towers, the Pentagon, and United Airlines Flight 93 claimed nearly 3,000 lives. The incident began when terrorists from the Islamist extremist group al-Qaeda hijacked four planes and deliberately crashed them.

At 8:46 am EST, American Airlines Flight 11 hit the north tower of New York's World Trade Center. Shortly after that, another plane hit the south tower of the World Trade Center, Parade reported.

​The 9/11 attack continued with one flight deliberately hitting the Pentagon building in Washington, while another crashed in a field near Pennsylvania's Shanksville.

This year marks the 2...