On September 11, 2001, the organization known as al-Qaeda carried out the deadliest attack on US soil in the country's entire history that killed nearly 3,000 people. In response, the US launched the Global War on Terror, a worldwide conflict aimed at combatting terrorism and especially aimed at combatting al-Qaeda, with the primary goal to kill or capture all of al-Qaeda's leadership. The war included some of the biggest and most extensive manhunts in human history as al-Qaeda's leadership was relentlessly pursued by the US for decades after the attacks, and eventually culminated with the capture of Khalid Sheikh Mohammed in 2003, and the killing of Osama bin-Laden himself during a raid by US special forces in Pakistan in 2011.