The three main Jewish underground forces later united to form the Jewish Resistance Movement and carry out several attacks and bombings against the British administration. In 1946, the Irgun blew up the King David Hotel in Jerusalem, the headquarters of the British administration, killing 92 people. Following the bombing, the British Government began interning illegal Jewish immigrants in Cyprus. In 1948 the Lehi assassinated the UN mediator Count Bernadotte in Jerusalem. Yitzak Shamir, future prime minister of Israel was one of the conspirators.