On 6 December 1975 , a day later known as Black Saturday , the killings of four Phalange members led Phalange to quickly and temporarily set up roadblocks throughout Beirut at which identification cards were inspected for religious affiliation . Many Palestinians or Lebanese Muslims passing through the roadblocks were killed immediately . Additionally , Phalange members took hostages and attacked Muslims in East Beirut . Muslim and Palestinian militias retaliated with force , increasing the total death count to between 200 and 600 civilians and militiamen . After this point , all-out fighting began between the militias
Black Saturday
Black Saturday (Lebanon)
Lebanese Civil War