 The Haganah again briefly worked to suppress Irgun and Lehi operations, due to the presence of a United Nations investigative committee in Palestine.The insurgency lasted until the eruption of the civil war, though British and Zionist forces continued to clash throughout the period of the civil war up to the termination of the British Mandate for Palestine and the Israeli Declaration of Independence on 14 May 1948.The armed conflict escalated during the final phase of the World War II, when the Irgun declared a revolt in February 1944, ending the hiatus in operations it had begun in 1940.