After Germany sparked World War II by invading Poland in September 1939, the "Schutzstaffel" (SS) converted Auschwitz I, an army barracks, into a prisoner-of-war camp for Polish political prisoners. The first inmates, German criminals brought to the camp in May 1940 as functionaries, established the camp's reputation for sadism. Prisoners were beaten, tortured, and executed for the most trivial reasons. The first gassings—of Soviet and Polish prisoners—took place in block 11 of Auschwitz I around August 1941. Construction of Auschwitz II began the following month, and from 1942 until late 1944 freight trains delivered Jews from all over German-occupied Europe to its gas chambers. Of the 1.3 million people sent to Auschwitz, 1.1 million died. The death toll includes 960,000 Jews (865,000 of whom were gassed on arrival), 74,000 ethnic Poles, 21,000 Roma, 15,000 Soviet prisoners of war, and up to 15,000 other Europeans. Those not gassed died of starvation, exhaustion, disease, individual executions, or beatings. Others were killed during medical experiments.