Sobibór
Sobibór was a
Nazi extermination camp that was part of
Operation Reinhard.
Jews,
Soviet POWs, and possibly
Gypsies were transported to Sobibór by rail, and suffocated in gas chambers that were fed with the exhaust of a diesel motor. About 260,000 people were killed in Sobibór.
External link
http://auschwitz.dk/Sorbibor.htm contains a description of Sobibór.