Bełzec<span>, </span>Sobibor <span>and </span>Treblinka had gas chambers, built for purpose to kill Jews (<span>implementing the secretive </span>Operation Reinhard, the plan to completely destroy Polish Jews). Construction of Belzec, Sobibor and Treblinka began in autumn 1941. A<span>pproximately 1,5 million Jews were killed in this three camps.</span>