A few months later, Bulgaria itself became a target. Between November 14, 1943 and January 10, 1944, The United States Army Air Force bombed Sofia six times. (The daylight raid on January 10, 1944 was also followed by a British nighttime bombing.) The raids killed an estimated 1,374 people, and damaged many downtown buildings. The National Library was destroyed and the National Theater and Museum of Natural History and other important buildings downtown were badly damaged. Thousands of civilians were evacuated to the countryside. (See Bombing of Sofia in World War II.)