According to a highly redacted CIA intelligence report from January 31, 1997, titled, “Terrorism: cooperation among Usama Bin Ladin’s Islamic Army, Iran, and the NIF (Sudan’s National Islamic Front)”: “Shortly after the tripartite agreement was reached [redacted] operatives traveled to southern Lebanon to receive training in explosives from Hizballah. [Redacted] Iran also began training individuals.”
– CIA, “Terrorism: Cooperation Among Usama Bin Ladin’s Islamic Army, Iran and the NIF,” (CIA Intelligence Report), The Central Intelligence Agency’s 9/11 File:, The National Security Archive, Jan. 31, 1997