 During that surprise action, more than 2,700 Jews were arrested, including the senior leadership of the Haganah.The British obtained documentary evidence of Jewish Agency involvement in paramilitary acts and collusion between the Haganah and the more violent groups, Irgun and Lehi.Operation Agatha led to the formation of the Jewish Resistance Movement, one of whose acts was the King David Hotel bombing on 22 July 1946, an attack on the British administration headquarters for Palestine, where it was thought that incriminating documentation seized during Operation Agatha was being held.