In 1982, the PLO attacks from Lebanon on Israel led to an Israeli invasion, aiming to support Lebanese forces in driving out the PLO. A multinational force of American, French and Italian contingents (joined in 1983 by a British contingent) were deployed in Beirut after the Israeli siege of the city, to supervise the evacuation of the PLO. The civil war re-emerged in September 1982 after the assassination of Lebanese President Bashir Gemayel, an Israeli ally, and subsequent fighting. During this time a number of sectarian massacres occurred, such as in Sabra and Shatila, and in several refugee camps. The multinational force was withdrawn in the spring of 1984, following a devastating bombing attack during the previous year.