The September 11 attacks caused damage.
September 11 attacks . The attacks killed 2,996 people , injured over 6,000 others , and caused at least $ 10 billion in property and infrastructure damage . Within an hour and 42 minutes , both 110-story towers collapsed , with debris and the resulting fires causing partial or complete collapse of all other buildings in the World Trade Center complex , including the 47-story 7 World Trade Center tower , as well as significant damage to ten other large surrounding structures . The destruction of the World Trade Center and nearby infrastructure caused serious damage to the economy of Lower Manhattan and had a significant effect on global markets , closing Wall Street until September 17 and the civilian airspace in the U.S. and Canada until September 13 .