On the night of 30–31 May 1942, Cologne was the target for the first 1,000 bomber raid of the war. Between 469 and 486 people, around 90% of them civilians, were reported killed, more than 5,000 were injured, and more than 45,000 lost their homes. It was estimated that up to 150,000 of Cologne's population of around 700,000 left the city after the raid. The Royal Air Force lost 43 of the 1,103 bombers sent. By the end of World War II, 90% of Cologne's buildings had been destroyed by Allied aerial bombing raids, most of them flown by the RAF.