Nazi hunters with the Simon Wiesenthal Center say they've received two new tips in the past day in their search for a former concentration camp physician known as "Dr. Death."

Leo Adler, a spokesperson for the centre, told CTV's Canada AM on Friday investigators are now in South America looking for Aribert Heim. It's believed the former SS member may be in Chile or Argentina.

Holocaust survivors have told authorities that Heim was a Nazi doctor who tortured and killed hundreds of people during the Second World War.

"People who have committed such horrendous crimes, especially doctors, who've taken the Hippocratic Oath ... they should not be allowed to go to their deaths not even knowing that they're being hunted," Adler said.

Heim was held for more than two years by the U.S. military after the war -- but was released without a trial. Then in 1962, the SS member was indicted in Germany on charges that he killed hundreds of prisoners at Mauthausen concentration camp. But he disappeared after being tipped off.

If he is still alive, Heim would now be 94. But his family has said he died in the mid-1990s, a claim Adler said does not appear to be true.

"His lawyer is still very active and has never filed any papers saying he's dead," Adler said.

He said Heim has millions of dollars and other investments that haven't been claimed by his children. To claim the money, they would need to provide proof of Heim's death.

The Wiesenthal Center has said it has information "that has strong potential" to help their efforts to track down Heim.

"They believe that they are quite close and he is very much alive," he said.

If he is captured, Heim could be sent back to Germany. If he is too old or unhealthy to travel, Adler said he could also face trial in Chile.

Adler said Heim and other Nazis who escaped after the war were able to get away because of sympathetic friends -- and even with the help of international governments. He said Heim's capture is important because it sends the message that war crimes and crimes against humanity will not be tolerated -- no matter where or when they occurred.

With files from The Associated Press