In cooperation with German "Einsatzgruppen" and Ukrainian auxiliaries, Romanian troops killed hundreds of thousands of Jews in Bessarabia, northern Bukovina, and Transnistria; some of the larger massacres of Jews occurred at Bogdanovka, a Romanian concentration camp along the Bug River in Transnistria, between 21 and 30 December 1941. Nearly 100,000 Jews were killed in occupied Odessa and well over 10,000 were killed in the Iași pogrom of June 1941. Romanian troops also massacred Jews in the Domanevka and Akhmetchetka concentration camps.