![Auschwitz II (Birkenau) camp, summer 1944 [LCID: auc22023]](https://encyclopedia.ushmm.org/images/large/3d7ef175-0194-4d2e-b4d2-7e9535404954.gif)
In October 1941, the Nazi authorities at Auschwitz began building a second camp located in the Polish village of Brzezinka (called Birkenau in German). Beginning in March 1942, Auschwitz-Birkenau functioned as both a concentration camp and a killing center, where the Nazis murdered Jews in gas chambers. From November 1943 to November 1944, Auschwitz-Birkenau was designated as a separate camp and officially referred to as Auschwitz II.
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