Shin Bet
Following the assassination of Yitzhak Rabin, the Palestinian Authority began to cooperate more closely with Shin Bet in hunting Ayyash. Shin Bet learned (through means that remain classified ) that Ayyash had, on occasion, spent the night in the Gaza City home of Osama Hamad, a childhood friend of his. Shin Bet had previously had dealings with Kamil Hamad, Osama Hamad's uncle.