PHILADELPHIA — The chief Nazi hunter with the Simon Wiesenthal Center says age and the passage of time are no barriers to investigating alleged Nazi activity during World War II.

If a person is charged with war crimes, you don't just ignore the crime because a suspect has reached old age, said Efraim Zuroff, who called the German-led investigation of now 87-year-old Johann "Hans" Breyer of Philadelphia a powerful message that such efforts will continue.

"Old age should not protect people who committed such heinous crimes," Zuroff said Monday by phone from Israel.

Germany has launched a war crimes investigation against Breyer on allegations that he served as an SS guard at the Auschwitz death camp complex after years of failed attempts by the U.S. to revoke his citizenship.

Breyer resolutely denied those allegations and told The Associated Press in an interview in his home late last week that he was never at the camp.

"I had nothing to do with the camp. I told them over and over," he said, recalling a yearslong failed effort by the U.S. to strip him of his citizenship.

Instead, Breyer said he was at a nearby SS camp where he was trained to use a light infantry cannon.

On Sunday, Breyer repeated that he's not been contacted by Germany nor notified that he's under any investigation.

"I heard this from you," he told an AP reporter, reiterating that he was never a guard.

On Monday, a few reporters were parked outside the three-level row home he shares with his wife. No one answered the door but a handwritten sign read: "We do not have any comment. Please leave."

Breyer did not respond to messages left at his home.

Some neighbors declined to comment while others did not answer their doors.

For more than a decade, the Department of Justice waged court battles to try to have Breyer deported. They largely revolved around whether Breyer had lied about his Nazi past in applying for immigration or whether he could have citizenship through his American-born mother.

That legal saga ended in 2003, with a ruling that allowed him to stay in the United States, mainly on the grounds that he had joined the SS as a minor and could therefore not be held legally responsible for participation in it.

The Justice Department noted that it had proved, in court, that Breyer was involved in "Nazi-sponsored acts of persecution while serving as an SS guard" at Buchenwald and Auschwitz during World War II.

"However, findings concerning his mother's birth and the date of his SS enlistment made it legally impossible to deport him from the United States," Rebekah Carmichael, a department spokeswoman, told the AP in an email Monday.

"As a general matter, the Department of Justice has a more than 40-year record of close cooperation with European governments that seek to prosecute cases involving Nazi crimes, including through sharing of evidence and facilitation of extradition and deportation," she said.

German officials have not yet filed charges against Breyer, but he could be charged with accessory to murder, the same legal theory that prosecutors in Munich used to try and convict former Ohio autoworker John Demjanjuk on charges served as a death camp guard at Sobibor in occupied Poland.

Ukrainian-born Demjanjuk, who died in a Bavarian nursing home in March while appealing his 2011 conviction, was the first person convicted in Germany solely on the basis of serving as a camp guard, with no evidence of involvement in a specific killing.

Under the new legal theory, anyone who was involved in the operation of a death camp was an accessory to murder.

About 1.5 million people, primarily Jews, were killed at the Auschwitz camp complex between 1940 and 1945.

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  • May 2001

    Anton Malloth, an 89-year-old former guard at the Theresienstadt fortress in occupied Czechoslovakia, is sentenced to life in prison for beating and kicking a Jewish inmate to death in 1944. (Photo: AP)

  • July 2002

    Friedrich Engel, a 93-year-old former SS major, is convicted on 59 counts of murder for a 1944 massacre of Italian prisoners and given a suspended seven-year sentence. A federal court later quashes the conviction, doubting the evidence was sufficient. Engel dies in 2006. (Photo: AP)

  • February 2004

    A court halts the trial of Herbertus Bikker, an 88-year-old former SS member, on charges of killing a Dutch prisoner during World War II. He is ruled medically unfit to stand trial. He dies in 2008. (Photo: AP)

  • December 2005

    An 88-year-old former Nazi commander, Ladislav Niznansky, is acquitted of murder in three massacres in Slovakia. Court cites insufficient evidence. He dies in 2011. (Photo: AP)

  • August 2009

    Josef Scheungraber, a 90-year-old former officer in the German army, is convicted of murder for ordering the massacre of 10 civilians in a 1944 reprisal killing in Italy; sentenced to life imprisonment. His appeal is rejected. (Photo: AP)

  • November 2009

    Prosecutors file charges against former SS Sgt. Adolf Storms on 58 counts of murder in connection with a massacre of Jewish forced laborers in Austria in 1945. Storms dies in July 2010 at age 90, before he can be brought to trial. (Photo: AP File)

  • March 2010

    Heinrich Boere, 88, is convicted of murdering three civilians in the Netherlands when he was a member of a Waffen SS death squad in 1944; sentenced to life imprisonment. His appeal is rejected. (Photo: Getty)

  • July 2010

    Samuel Kunz, 88, is charged with participating in the murder of 430,000 Jews while serving as a low-ranking guard at the Belzec death camp (seen in photo). Kunz dies in November 2010, before he can be brought to trial. (Photo: Getty)

  • May 12, 2011

    John Demjanjuk, 91 was convicted for having been a guard at the Sobibor concentration camp in Nazi-occupied Poland from March 27 to mid-September 1943, and received one count of being an accessory to murder for each person who died during that time frame. Demanjuk dies in March 2012. (Photo: AP)