 Complete the following phrase:  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 