Army. British police station in Haifa On 12 January 1947, Lehi members drove a truckload of explosives into a British police station in Haifa killing four and injuring 140, in what has been called 'the world's first true truck bomb'. Operations in Europe Following the bombing of the British embassy in Rome, in October 1946, a series of operations against targets in the United Kingdom were launched. On 7 March 1947, Lehi's only successful operation in Britain was carried out when a Lehi bomb severely damaged the British Colonial Club, a London recreational facility for soldiers and students from Britain's colonies in Africa and the West Indies. On 15 April 1947 a bomb consisting of twenty-four sticks of explosives was planted in the Colonial Office, Whitehall. It failed to explode due to a fault in the timer. Five weeks later, on 22 May, five alleged Lehi members were arrested in Paris with bomb making material including explosives of the same type as found in London. On 2 June, two Lehi members, Betty Knouth and Yaakov Levstein, were arrested crossing from Belgium to France. Envelopes addressed to British officials, with detonators, batteries and a time fuse were found in one of Knouth's suitcases. Knouth was sentenced to a year in prison, Levstein to eight months. The British Security Services identified Knouth as the person who planted the bomb in the Colonial Office. Shortly after their arrest, 21 letter bombs addressed to senior British figures were intercepted. The letters had been posted in Italy. The intended recipients included Bevin, Attlee, Churchill and Eden. Knouth aka Gilberte/Elizabeth Lazarus. Levstein was travelling as Jacob Elias; his fingerprints connected him to the deaths of several Palestine Policemen as well as an attempt on the life of the British High Commissioner. In 1973, Margaret Truman wrote that letter bombs were also posted to her father, U.S. President Harry S. Truman, in 1947. Former Lehi leader Yellin-Mor admitted that letter bombs had been sent to British targets but denied that any had been sent to Truman. Death threat against Hugh Trevor-Roper Shortly after the 1947 publication of The Last Days of Hitler, Lehi issued a death threat against the author, Hugh Trevor-Roper, for his portrayal of Hitler, feeling that Trevor-Roper had attempted to exonerate the German populace from responsibility. Cairo-Haifa train bombings During the lead-up to the 1948 Arab–Israeli War, Lehi mined the Cairo–Haifa train several times.