In November 1941 Himmler was dissatisfied with the pace of the exterminations in Latvia, as he intended to move Jews from Germany into the area. He assigned SS-Obergruppenführer Jeckeln, one of the perpetrators of the Babi Yar massacre, to liquidate the Riga ghetto. Jeckeln selected a site about 10 kilometres (6.2 mi) southeast of Riga near the Rumbula railway station, and had 300 Russian prisoners of war prepare the site by digging pits in which to bury the victims.