Phalangist forces killed twenty-six Fatah trainees on a bus in April 1975 , marking the official start of the 15-year-long Lebanese civil war . Later that year , an alliance of Christian militias overran the Palestinian refugee camp of Karantina killing over 1,000 civilians . The PLO and LNM retaliated by attacking the town of Damour , a Phalangist and Tigers ( Ahrar ) stronghold , killing 684 civilians . As the civil war progressed over 2 years of urban warfare , both parties resorted to massive artillery duels and heavy use of sniper nests , while atrocities and war crimes were committed by both sides
Damour
Damour massacre
Fatah