394261 79: Firefighters watch as smoke rises from the site of the World Trade Center collapse September 11, 2001 in New York City after two hijacked airplanes crashed into the twin towers in a terrorist attack. (Photo by Mario Tama/Getty Images)
394261 79: Firefighters watch as smoke rises from the site of the World Trade Center collapse September 11, 2001 in New York City after two hijacked airplanes crashed into the twin towers in a terrorist attack. (Photo by Mario Tama/Getty Images)