They were shipped to concentration camps starting in 1935 and many were killed.[180][181] Following the invasion of Poland, 2,500 Roma and Sinti people were deported from Germany to the General Government, where they were imprisoned in labour camps. The survivors were likely exterminated at Bełżec, Sobibor, or Treblinka. A further 5,000 Sinti and Austrian Lalleri people were deported to the Łódź Ghetto in late 1941, where half were estimated to have died.