The Polish underground warned Jews that this was probably a trap, but many ignored the warnings.[5] Starting May 21 1943, Jews from Hotel Polski were transferred in small groups by Nazi German authorities to Vittel, a spa resort town in German-occupied France, which was supposed to be their transit point; later transports only made it to Bergen-Belsen concentration camp in Germany.[5][2][3] On 15 July 1943, the 420 Jews remaining in the Hotel without foreign passports were executed by the Germans at Pawiak prison.[10] By September 1943, the Germans revealed that most of the documents of the individuals in the transit camps were forged, and the South American governments refused to recognize most of the passports.[4][10] Therefore, instead of being transferred to South America, the Jews were sent to Auschwitz concentration camp in May 1943 and October 1943.[10] A few hundred Jews who held Palestinian documents survived, having been exchanged for Germans imprisoned in Palestine.[10] (Jewish Historical Institute cited the number of survivors at 260;[4] Haska estimates the number of survivors at about 300, noting that due to incomplete documentation it is not possible to precisely estimate the number of victims or survivors.[4]) The Palestinian survivors were helped by Daniel Guzik, formerly associated with the American Jewish Joint Distribution Committee.[4]