Lebanese MP, Maarouf Saad, was shot and killed, reportedly by the Lebanese Army. His death from his wounds, the following month, and the massacre in April of 27 Palestinians and Lebanese travelling on a bus from Sabra and Shatila to the Tel al-Zaatar refugee camp by Phalangist forces precipitated the Lebanese Civil War. Arafat was reluctant to respond with force, but many other Fatah and PLO members felt otherwise. For example, the DFLP carried out several attacks against the Lebanese Army. In 1976, an alliance of Christian militias with the backing of the Lebanese and Syrian armies besieged Tel al-Zaatar camp in east Beirut. The PLO and LNM retaliated by attacking the town of Damour, a Phalangist stronghold where they massacred 684 people and wounded many more. The Tel al-Zaatar camp fell to the Christians after a six-month siege in which thousands of Palestinians, mostly civilians, were killed. Arafat and Abu Jihad blamed themselves for not successfully organizing a rescue effort. PLO cross-border raids against Israel grew during the late 1970s. One of the most severe—known as the Coastal Road massacre—occurred on 11 March 1978. A force of nearly a dozen Fatah fighters landed their boats near a major coastal road connecting the city of Haifa with Tel Aviv-Yafo. There they hijacked a bus and sprayed gunfire inside and at passing vehicles, killing thirty-seven civilians. In response, the IDF launched Operation Litani three days later, with the goal of taking control of Southern Lebanon up to the Litani River. The IDF achieved this goal, and Arafat withdrew PLO forces north into Beirut. After Israel withdrew from Lebanon, cross-border hostilities between PLO forces and Israel continued, though from August 1981 to May 1982, the PLO adopted an official policy of refraining from responding to provocations. On 6 June 1982, Israel launched an invasion of Lebanon to expel the PLO from southern Lebanon. Beirut was soon besieged and bombarded by the IDF; Arafat declared the city to be the "Hanoi and Stalingrad of the Israeli army." The Civil War's first phase ended and Arafat—who was commanding Fatah forces at Tel al-Zaatar—narrowly escaped with assistance from Saudi and Kuwaiti diplomats. Towards the end of the siege, the US and European governments brokered an agreement guaranteeing safe passage for Arafat and the PLO—guarded by a multinational force of eight hundred US Marines supported by the US Navy—to exile in Tunis. Arafat returned to Lebanon