Yahya Ayyash

Ayyash first came to the attention of Israeli security forces as a result of the failed bombing of Ramat Ef'al. Following a high-speed chase, three would-be Hamas suicide bombers were arrested by police. When police inspected their car, they found it rigged with a bomb—five 12-kilogram (26 lb) gasoline tanks filled to capacity, connected to an acetone peroxide-based detonator. After evacuating the area, sappers used a robot armed with a shotgun to shoot the detonator, in the hopes of defusing it. Instead, it detonated, in a massive explosion. [Police investigators] "were sure that if it had been detonated in a crowded area, it would have killed hundreds".

Israel has a policy that it never confirms or denies its participation in targeted killings. Per this policy, Israel did not confirm or deny its role in killing Ayyash. This led to wild rumors and speculations as to the extent of their involvement. In 2012, former Shin Bet director Carmi Gillon confirmed the story in the documentary The Gatekeepers. Kamil Hamad has disappeared, the Israeli press speculates that for betraying Ayyash he received US$1 millon, a fake passport and a visa to the US.

In April 2010, Israel's Channel 10 reported that the Palestinian Authority named a street in Ramallah after Ayyash. The future presidential compound of the PA is being built on the street. Only a few weeks earlier, a square in Ramallah was named after the Palestinian militant Dalal Mughrabi who directed the 1978 Coastal Road massacre. PA sources said the PA did not intend to name the street after Ayyash. The Ramallah Municipality stated that the street name had been chosen at the end of the 1990s shortly after Ayyash's death. In response, Israel, the United States and Canada condemned the Palestinian Authority. The Israeli Prime Minister's Office called it an "outrageous glorification of terrorism by the Palestinian Authority" while a U.S. State Department spokesperson stated "we also strongly condemn the glorification of terrorists. Honoring terrorists who have murdered innocent civilians either by official statements or by the dedication of public places hurts peace efforts and must end."

Kamil Hamad gave the phone to his nephew Osama, knowing that Ayyash regularly used Osama's phones. At 08:00 on 5 January 1996, Ayyash's father called him. Ayyash picked it up and talked with his father. Overhead, an Israeli plane picked up their conversation and relayed it to an Israeli command post. When it was confirmed that it was Ayyash on the phone, Shin Bet remotely detonated it, killing Ayyash instantly. He was killed in Beit Lahia.

Following Ayyash's death, four suicide bombings killed seventy-eight Israelis in February and March 1996. The first of these took place shortly after the end of the 40-day mourning period for Ayyash and the cell that claimed responsibility called itself "Disciples of the martyr Yahya 'Ayyash", stating it was a revenge attack for his assassination. Israeli security services who later interrogated one of the organizers of the attacks said they were carried out by a sub-group of the Qassam Brigades, and that, "the attacks were most probably a direct reaction to the assassination of 'Ayyash [with] no far-reaching political goal."

In October 1995, Shin Bet operatives approached Kamil Hamad. Kamil Hamad demanded money and Israeli identity cards for himself and his wives. After the Shin Bet threatened to inform Hamas of his betrayal, Kamil Hamad agreed to cooperate. Shin Bet agents gave Hamad a cell phone, and told him it was bugged so they could listen in on Ayyash's conversations. They did not tell Hamad that, in addition to eavesdropping devices, it also contained 15 grams of RDX explosive.

Yahya Abd-al-Latif Ayyash (Arabic: يحيى عياش ‎) (22 February 1966 – 5 January 1996) was the chief bombmaker of Hamas and the leader of the West Bank battalion of the Izz ad-Din al-Qassam Brigades. In that capacity, he earned the nickname the Engineer (Arabic: المهندس ‎, transliterated al-Muhandis). He was assassinated by Shin Bet on 5 January 1996.

Ayyash was born in Rafat on 22 February 1966, the eldest of three brothers. Al Qassam's website, however, states his birth date as 3 March 1966. As a child, he was very pious, receiving an award from the Islamic Trust for his talent in memorizing the Quran. While a boy, Ayyash showed a talent for electrical and mechanical work—repairing radios, television sets, and the like. After graduating from high school in 1985, he entered Birzeit University in 1987. He received a bachelor of science degree in electrical engineering in 1991.