The Holocaust in Bulgaria was the persecution, deportation, and annihilation of Jews between 1939 and 1944 in the Kingdom of Bulgaria and Bulgarian-occupied Yugoslavia and Greece during World War II, arranged by the Nazi Germany-allied government of Tsar Boris III and prime minister Bogdan Filov. The persecution began in 1939, intensified after early 1941, and culminated in deportations of Jews from Bulgaria to extermination camps. The arrest and deportation of Jews began in March 1943. Almost all11,343of the Jews living in Bulgarian-occupied regions of Macedonia, Thrace, and Pomoravlje were deported by the Bulgarian authorities, and sent on through Bulgaria to the Treblinka extermination camp in German-occupied Poland.