Terrorism emerged as an increasingly important national security issue during Clinton's administration. In the closing years of the Soviet–Afghan War, Osama bin Laden had organized al-Qaeda, a militant Sunni organization. The al-Qaeda leaders despised Western values, and were particularly incensed by the U.S. military presence in Saudi Arabia. Al-Qaeda grew during the 1990s and engaged in terrorism in the Middle East and elsewhere. The group claimed responsibility for the 1993 World Trade Center bombing, the bombings of two U.S. embassies in East Africa, and the bombing of a U.S. ship at port in Yemen. In retaliation, Clinton ordered the bombing of al-Qaeda facilities in Afghanistan and Sudan. The Central Intelligence Agency and the military tracked bin Laden's movements in an attempt to capture or kill him, but Bin Laden evaded capture deep within the mountains of Afghanistan.