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 . 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 .