The Bulgarian capital of Sofia suffered a series of Allied bombing raids during World War II, from late 1943 to early 1944. United Kingdom and the United States declared a token war on Bulgaria on 13 December 1941. The Southern Italy-based Allied air forces extended the range of their strategic operations to include Bulgaria and other Axis allies in 1943.
During the invasions of Yugoslavia and of Greece, the Yugoslav and British air forces targeted strategic points in Bulgaria, from which German troops had staged the invasions.
On 6 April, Yugoslav Dornier Do 17 aircraft bombed the industrial section of Sofia and Kyustendil. In Sofia, eight people were killed. In the bombing of Kyustendil 58 civilians, two Bulgarian and eight German soldiers were killed and 59 civilians, five Bulgarian and 31 German soldiers were wounded.
Between 20:05 and 21:40 on 6 April, the Royal Air Force (RAF) carried out bombing raids over Bulgaria. Bristol Blenheim aircraft bombed Petrich and Haskovo and six Vickers Wellington bombers dropped bombs over Sofia and nearby villages. During the bombing of the capital, 18 people were killed and 28 were wounded; 14 building were destroyed and three fires were started. Sofia was bombed a second time on 13 April, provoking a large exodus.
The air raid was carried out on 14 November 1943 by 91 B-25 Mitchell bombers. Forty-seven buildings and structures were destroyed, 59 civilians and military men were killed and over 128 were injured.