Related article:
Iran and Osama: Match Made In Hell -- "must read" lots of specifics
http://globalpolitician.com/articles.asp?ID=291&t=Iran+and+Osama%3A+Match+Made+In+Hell
"Beginning in 1992, an agreement was reached. In return for Zawahiri’s efforts in the movement led by Iran, the Iranians agreed to provide a safe harbor and training camp for about 800 of the Egyptian Islamic Jihad terrorists in Mashhad. Iranian proxy forces like Hezbollah, and the Pasdaran division of the Iranian Revolutionary Guard Corps based in Sudan would assist in virtually all areas of Zawahiri’s contributions to the movement. "