After World War II, as a result of the British policies, the Jewish resistance organizations united and established the Jewish Resistance Movement which coordinated armed attacks against the British military which took place between 1945 and 1946. Following the King David Hotel bombing (in which the Irgun blew up the King David Hotel in Jerusalem, the headquarters of the British administration), which shocked the public because of the deaths of many innocent civilians, the Jewish Resistance Movement was disassembled in 1946. The leadership of the Yishuv decided instead to concentrate their efforts on the illegal immigration and began to organize a massive immigration of European Jewish refugees to Palestine using small boats operating in secrecy, many of which were captured at sea by the British and imprisoned in camps on Cyprus. About 70,000 Jews were brought to Palestine in this way in 1946 and 1947. Details of the Holocaust had a major effect on the situation in Palestine and propelled large support for the Zionist movement.