On April 13, 1975, a bus passing through Ain Al-Remmaneh, transporting Palestinians returning from a festival, heading up to their camp in Tel al-Zaatar, was gunned down by militiamen of the Kataeb party, killing all the 27 passengers except the driver, which marked the start of the Lebanese Civil War.[6][7][13] The incident happened just hours after 4 Christians were killed outside a nearby church[6] in Ain El-Remmaneh in an assassination attempt of the Phalangist (Kataeb) leader Pierre Gemayel.[14][15][16]