In the early 1990s, Ali Mohamed, a former United States Army Special Forces supply sergeant, returned to Afghanistan, where he gave training in al-Qaeda camps. According to FBI special agent Jack Cloonan, in one of Mohamed's first classes were Osama bin Laden, Ayman al-Zawahiri, and other al-Qaeda leaders. According to the "San Francisco Chronicle", he was involved in planning the 1998 bombings of US embassies in Africa.