On 20 August 1941, French police conducted raids throughout the 11th arrondissement of Paris and arrested more than 4,000 Jews, mainly foreign or stateless Jews. French authorities interned these Jews in Drancy, marking its official opening. French police enclosed the barracks and courtyard with barbed-wire fencing and provided guards for the camp. Drancy fell under the command of the Gestapo Office of Jewish Affairs in France and German SS Captain Theodor Dannecker. Five subcamps of Drancy were located throughout Paris (three of which were the Austerlitz, Lévitan and Bassano camps). Following the Vel' d'Hiv Roundup on 16 and 17 July 1942, more than 4,900 of the 13,152 victims of the mass arrest were sent directly to the camp at Drancy before their deportation to Auschwitz.