The Białystok Ghetto was established in 1941, following the murder of 7,000 Jews from Białystok and surrounding areas by Einsatzgruppe B, Police Battalion 309, and Police Battalion 316. In February 1943, 8,000 Jews were deported from the ghetto to Treblinka extermination camp and another 2,000 were executed in the ghetto. On 16 August 1943, the final liquidation of the ghetto began. Although some Jews revolted, Police Regiment 26 (largely composed of Ukrainian collaborators) and other German forces crushed the uprising. Between 17 and 23 August, more than 25,000 Jews were deported to Treblinka and Auschwitz-Birkenau.