premise: The World Trade Center was destroyed as the result of attacks.
hypothesis: The Twin Towers of the World Trade Center collapsed on September 11 , 2001 , as a result of being struck by two jet airliners hijacked by 10 terrorists affiliated with al-Qaeda , during the September 11 attacks . One World Trade Center . The supertall structure has the same name as the North Tower of the original World Trade Center , which was completely destroyed in the terrorist attacks of September 11 , 2001 . World Trade Center (1973–2001) . It featured landmark twin towers , which opened on April 4 , 1973 , and were destroyed as a result of the September 11 attacks . The World Trade Center is a partially completed complex of buildings under construction in Lower Manhattan , New York City , U.S. , replacing an original complex of seven buildings with the same name on the same site that were damaged or destroyed in the September 11 attacks . They were destroyed on the morning of September 11 , 2001 , when al-Qaeda-affiliated hijackers flew two Boeing 767 jets into the complex in a coordinated act of terrorism .