sentences:  In early 1943, new gas chambers and crematoria were built to accommodate the numbers.Bełżec, Sobibór and Treblinka became known as the Operation Reinhard camps, named after the German plan to murder the Jews in the General Government area of occupied Poland.Between March 1942 and November 1943, around 1,526,500 Jews were gassed in these three camps in gas chambers using carbon monoxide from the exhaust fumes of stationary diesel engines.