The city was badly damaged in bombing World War II, especially between 1943 and 1945. On January 2, 1945, the medieval city centre was bombed by the Royal Air Force and the U.S. Air Force and about ninety percent of it was destroyed in only one hour, with 1800 residents killed and roughly 100,000 left homeless. In February 1945, more attacks followed. In total, about 6000 Nuremberg residents are estimated to have been killed in air raids. Despite this, the city was rebuilt after the war and was to some extent, restored to its pre-war appearance including the reconstruction of some of its medieval buildings.