August 30-September 4, 2001: According to Egyptian President Mubarak, Egyptian intelligence warns American officials that bin Laden's network is in the advanced stages of executing a significant operation against an American target, probably within the US. [AP, 12/7/01, New York Times, 6/4/02] He says he learned this information from an agent working inside al-Qaeda. US officials deny receiving any such warning from Egypt. [ABC News, 6/4/02]