1 . The Pentagon , US – September 11 , 2001 2 . World Trade Center , US – September 11 , 2001 3 . Istanbul , Turkey – November 15 and 20 , 2003 4 . Aden , Yemen – October 12 , 2000 5 . Nairobi , Kenya – August 7 , 1998 6 . Dar es Salaam , Tanzania – August 7 , 1998 Al-Qaeda has carried out a total of six major attacks , four of them in its jihad against America . In each case the leadership planned the attack years in advance , arranging for the shipment of weapons and explosives and using its businesses to provide operatives with safehouses and false identities
World Trade Center , US
September 11 attacks
Al-Qaeda