( CNN ) -- Historians believe they have found a World War II-era mass grave containing the bodies of 220 disabled people killed by Nazis in Austria , they announced this week . The discovery was made by searching files from a mental hospital in the town of Hall , Austria , according to the company that currently runs the institution . The company believes the remains are those of people murdered under a Nazi euthanasia program designed to eliminate `` undesirables . '' Tilak , the company running the hospital , says a group of historians led by Oliver Seifert found a map with the outlines of a former cemetery . `` Thanks to the map we know the approximate position of the cemetery and also the number of graves . Right now we believe that 220 people are buried there , '' a Tilak statement quotes Seifert as saying . Tilak says it plans to exhume the victims starting in March . `` Tilak sees it as our moral duty to the relatives of those killed to completely clarify the history of the mental institution 's graveyard , '' the press release says . The Nazis annexed Austria in 1938 after their leader , Adolf Hitler , came to power in Germany in 1933 . The regime systematically murdered about 6 million Jews , as well as millions of other people including Roma ( Gypsies ) , disabled people , homosexuals , political prisoners and others they considered less than human .
The remains of 220 disabled people are thought to be buried in the Austrian graveyard . Historians think the people were killed by Nazis trying to eliminate `` undesirables '' A map of the graves was found by historians studying hospital records . The company that runs the hospital plans to exhume them starting in March .