Although most of the Palestinian guerrillas were expelled during the 1982 Israeli invasion, Palestinian militias began to regain their footing after the Israeli withdrawal from first Beirut, then Sidon and Tyre. Syria viewed this revival with some anxiety: though in the same ideological camp, Damascus had little control over most Palestinians organizations and was afraid that the build-up of Palestinian forces could lead to a new Israeli invasion. In Lebanon, Shia–Palestinian relations had been very tense since the late 1960s. After the multinational force withdrew from Beirut in February 1984, Amal and the PSP took control of west Beirut and Amal built a number of outposts around the camps (in Beirut but also in the south). On April 15, 1985, Amal and the PSP attacked Al-Murabitun, the main Lebanese Sunni militia and the closest ally of the PLO in Lebanon. Al-Murabitun were vanquished and their leader, Ibrahim Kulaylat was sent into exile. On May 19, 1985, heavy fighting erupted between Amal and the Palestinians for the control of the Sabra, Shatila and Burj el-Barajneh camps (all in Beirut). On May 28, 1985, Amal suffered a suicide attack by four young female Palestinian suicide bombers in Shatila. Despite its efforts, Amal could not take the control of the camps. The death toll remains unknown, with estimates ranging from a few hundreds to a few thousands. This and heavy Arab pressure led to a cease-fire on June 17.