Images from Sept. 11, 2001, capture the horrific moment hijacked planes crashed into the World Trade Center Twin Towers, along with the panicked faces of survivors running amid a large plume of smoke.

Nearly two decades later, the photographs are a reminder of the nearly 3,000 lives lost in the attacks and the first responders who risked their lives to rescue those who were lost in the rubble.

How many planes were hijacked on 9/11?

According to the 9/11 Memorial Museum, four commercial planes were hijacked on Sept. 11, 2001, two of which crashed into the Twin Towers. A third plane crashed into the Pentagon in Arlington, Virginia. After learning about the other attacks, passengers on the fourth hijacked plane, Flight 93, fought back, and the plane was crashed into an empty field in west

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