was over a third of Palestine's total Jewish population. Many new Jewish immigrants to Palestine disembarked in Jaffa, and remained in Tel Aviv, turning the city into a center of urban life. Friction during the 1936–39 Arab revolt led to the opening of a local Jewish port, Tel Aviv Port, independent of Jaffa, in 1938. It closed on 25 October 1965. Lydda Airport (later Ben Gurion Airport) and Sde Dov Airport opened between 1937 and 1938. Many German Jewish architects trained at the Bauhaus, the Modernist school of architecture in Germany, and left Germany during the 1930s. Some, like Arieh Sharon, came to Palestine and adapted the architectural outlook of the Bauhaus and similar schools to the local conditions there, creating what is recognized as the largest concentration of buildings in the International Style in the world. Tel Aviv's White City emerged in the 1930s, and became a UNESCO World Heritage Site in 2003. During World War II, Tel Aviv was hit by Italian airstrikes on 9 September 1940, which killed 137 people in the city. During the Jewish insurgency in Mandatory Palestine, Jewish Irgun and Lehi guerrillas launched repeated attacks against British military, police, and government targets in the city. In 1946, following the King David Hotel bombing, the British carried out Operation Shark, in which the entire city was searched for Jewish militants and most of the residents questioned, during which the entire city was placed under curfew. During the March 1947 martial law in Mandatory Palestine, Tel Aviv was placed under martial law by the British authorities for 15 days, with the residents kept under curfew for all but three hours a day as British forces scoured the city for militants. In spite of this, Jewish guerrilla attacks continued in Tel Aviv and other areas under martial law in Palestine. According to the 1947 UN Partition Plan for dividing Palestine into Jewish and Arab states, Tel Aviv, by then a city of 230,000, was to be included in the proposed Jewish state. Jaffa with, as of 1945, a population of 101,580 people—53,930 Muslims, 30,820 Jews and 16,800 Christians—was designated as part of the Arab state. Civil War broke out in the country and in particular between the neighbouring cities of Tel Aviv and Jaffa, which had been assigned to the Jewish and Arab states respectively. After several months of siege, on 13 May 1948, Jaffa fell and