The Deir Yassin massacre took place on April 9, 1948, when Zionist paramilitaries attacked the village of Deir Yassin near Jerusalem, then part of Mandatory Palestine, killing at least 107 Palestinian Arab villagers, including women and children. The attack was conducted primarily by the Irgun and Lehi, who were supported by the Haganah and Palmach. The massacre was carried out despite the village having agreed to a non-aggression pact. It occurred during the 1947–1948 civil war and was a central component of the Nakba and the 1948 Palestinian expulsion and flight.