Fuel onboard United Flight 175 explodes in a horrific fireball just after the plane hits the south tower of the World Trade Center on Sept. 11, 2001. Fires ignited by the two crashes would later cause the twin towers to collapse.

Fuel onboard United Flight 175 explodes in a horrific fireball just after the plane hits the south tower of the World Trade Center on Sept. 11, 2001. Fires ignited by the two crashes would later cause the twin towers to collapse.

As the north tower of the World Trade center burns in the background, United Airlines Flight 175 is lined up to strike the south tower at 9:03 a.m. on Sept. 11, 2001. Terrorists took over that flight and also American Airlines Flight 11, crashing the planes into the twin towers

As the north tower of the World Trade center burns in the background, United Airlines Flight 175 is lined up to strike the south tower at 9:03 a.m. on Sept. 11, 2001. Terrorists took over that flight and also American Airlines Flight 11, crashing the planes into the twin towers

Flames, debris and smoke burst from the south tower of the World Trade Center as it is struck by United Airlines Flight 175 on Sept. 11, 2001. Although the south tower was the second to be struck, it would be the first to collapse.

Flames, debris and smoke burst from the south tower of the World Trade Center as it is struck by United Airlines Flight 175 on Sept. 11, 2001. Although the south tower was the second to be struck, it would be the first to collapse.

The south tower of New York's World Trade Center collapses Tuesday, Sept. 11, 2001.

The south tower of New York's World Trade Center collapses Tuesday, Sept. 11, 2001.

Frightened bystanders flee from the scene of the collapsing twin towers of the World Trade Center in New York City on Sept. 11, 2001.

Frightened bystanders flee from the scene of the collapsing twin towers of the World Trade Center in New York City on Sept. 11, 2001.

9/11 - Debris rains down on the street as the South Tower of the World Trade Center collapses after hijacked planes crashed into the towers on September 11, 2001 in New York City. (AP Photo/Richard Drew)

9/11 - Debris rains down on the street as the South Tower of the World Trade Center collapses after hijacked planes crashed into the towers on September 11, 2001 in New York City. (AP Photo/Richard Drew)

9/11 South Tower is Struck. #WorldTradeCenter Twin Towers (Two of the 4 Targets of #911) Remembering and Honoring the Heroes of 9-11-2001 9-11 #NeverForget #911 #Remembering911 9/11/2001 #LIFECommunity #Favorites From Pin Board #07

9/11 South Tower is Struck. #WorldTradeCenter Twin Towers (Two of the 4 Targets of #911) Remembering and Honoring the Heroes of 9-11-2001 9-11 #NeverForget #911 #Remembering911 9/11/2001 #LIFECommunity #Favorites From Pin Board #07

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