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Why did PLO forces leave Lebanon after the 1982 siege of West Beirut?
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Beirut
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The Palestine Liberation Organization (PLO) forces left Beirut in 1982 primarily as a result of the Israeli invasion of Lebanon, which began in June of that year with the stated goal of stopping PLO raids from across the border.12
Israeli forces quickly advanced to the outskirts of the Lebanese capital and laid siege to West Beirut, where the PLO had established its headquarters. Following intense military pressure and subsequent negotiations, the PLO agreed to evacuate the city. This withdrawal was conducted under the supervision of a multinational peacekeeping force, which oversaw the transport of PLO fighters to various sympathetic Arab countries. Following the evacuation, the PLO relocated its headquarters to Tunis, Tunisia.3214