Thanks to the Mossad, Israel's "Institute for Intelligence and Special Tasks", the Hamas was allowed to reinforce its presence in the occupied territories.

Meanwhile, Arafat's Fatah Movement for National Liberation as well as the Palestinian Left were subjected to the most brutal form of repression and intimidation

Let us not forget that it was Israel, which in fact created Hamas. According to Zeev Sternell, historian at the Hebrew University of Jerusalem, "Israel thought that it was a smart ploy to push the Islamists against the Palestinian Liberation Organisation (PLO)".

Ahmed Yassin, the spiritual leader of the Islamist movement in Palestine, returning from Cairo in the seventies, established an Islamic charity association. Prime Minister Golda Meir, saw this as a an opportunity to counterbalance the rise of Arafat's Fatah movement.

According to the Israeli weekly Koteret Rashit (October 1987), "The Islamic associations as well as the university had been supported and encouraged by the Israeli military authority" in charge of the (civilian) administration of the West Bank and Gaza.