At least one member of the al-Qaeda cell in Milan, Italy, apparently uses steganography, a method of encoding messages within computerized photographs. In Milan’s Via Quaranta mosque in Milan, frequented by Egyptian al-Qaeda operative Mahmoud Es Sayed, pictures of the World Trade Center that have steganographic messages in them are saved on a computer. A number of other pictures of world leaders and pornography are also manipulated in a similar manner. These pictures will not be discovered until months after 9/11, but they help suggest that some in the Milan cell had foreknowledge of the 9/11 plot. Es Sayed had been wiretapped on previous occasions, and was heard making comments suggesting he had such foreknowledge (see August 12, 2000)
(see January 24, 2001). His current whereabouts are unknown. [ABC News, 5/8/2003]