On 7 June 1981, the Israeli air force destroyed Iraq's sole nuclear reactor, in order to impede Iraq's nuclear weapons program. The reactor was under construction just outside Baghdad. Following a series of PLO attacks in 1982, Israel invaded Lebanon that year to destroy the bases from which the PLO launched attacks and missiles into northern Israel. In the first six days of fighting, the Israelis destroyed the military forces of the PLO in Lebanon and decisively defeated the Syrians. An Israeli government inquiry – the Kahan Commission – would later hold Begin, Sharon and several Israeli generals as indirectly responsible for the Sabra and Shatila massacre. In 1985, Israel responded to a Palestinian terrorist attack in Cyprus by bombing the PLO headquarters in Tunis. Israel withdrew from most of Lebanon in 1986, but maintained a borderland buffer zone in southern Lebanon until 2000, from where Israeli forces engaged in conflict with Hezbollah.