The SD-SiPo was the primary agency, in conjunction with the Ordnungspolizei, assigned to maintain order and security in the Jewish ghettos established by the Germans throughout occupied Eastern Europe.[104] On 7 December 1941, the same day that the American naval station at Pearl Harbor was bombed by the Japanese, the first extermination camp was opened at Chelmno near Lodz by the SD and SiPo commander in occupied Poznań (Posen), then SS-Standartenführer Ernst Damzog. Damzog had personally selected the staff for the killing centre and later supervised the daily operation of the camp, which was under the command of SS-Hauptsturmführer Herbert Lange.[105] Over a span of approximately 15 months, 150,000 people were killed there.[106]