On Tuesday , September 11th , 2001 , the opening of the New York Stock Exchange ( NYSE ) was delayed after the first plane crashed into the World Trade Center 's North Tower , and trading for the day was canceled after the second plane crashed into the South Tower . NASDAQ also canceled trading . The New York Stock Exchange was then evacuated as well as nearly all banks and financial institutions on Wall Street and in many cities across the country . The London Stock Exchange and other stock exchanges around the world were also closed down and evacuated in fear of follow-up terrorist attacks . The New York Stock Exchange remained closed until the following Monday . This was the third time in history that the NYSE experienced prolonged closure , the first time being in the early months of World War I and the second being March 1933 during the Great Depression . Trading on the United States bond market also ceased ; the leading government bond trader , Cantor Fitzgerald , was based in the World Trade Center . The New York Mercantile Exchange was also closed for a week after the attacks
the first plane
American Airlines Flight 11
Economic effects of the September 11 attacks