Ahmed Saleh
According to the Egyptian government, the bombers were Palestinians who had tried to enter Israel to carry out attacks there but were unsuccessful. They claimed that the mastermind, Iyad Saleh, recruited Egyptians and Bedouins to find explosives to be used in the attacks. Beginning in March 2004, the bombers used washing machine timers, mobile phones and modified gas cylinders to build the bombs. They used TNT and old explosives found in the Sinai (as it was many times a war zone), which were purchased from Bedouins, to complete the bombs. Egypt has said that Saleh and one of his aides, Suleiman Ahmed Saleh Flayfil, died in the Hilton blast, apparently because their bomb timer had run out too fast.