The gate, which bears the infamous slogan "Arbeit macht frei" ("Work will set you free”), was recovered in December in Gaupås in southwestern Norway following an anonymous tip-off.
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“We do not know the gate’s history. We have no information on how it ended up in Gaupås,” police inspector Paal Duley told Bergensavisen on Tuesday.
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Duley added that no DNA traces were found on the gate. No arrests have been made.Â
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The person who provided the anonymous tip-off to police is unknown and no one else has stepped forward with additional information.Â
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The 100-kilogramme black gate was reported stolen by German authorities in November 2014, sparking an uproar, with Germany's Chancellor Angela Merkel calling the crime "appalling".
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The gate is a 1965 replacement to the original one at the entrance to the Dachau camp, which disappeared after World War 2.Â
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The Dachau camp, located just a few kilometres from Munich, opened in 1933, less than two months after Adolf Hitler became chancellor.
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It was first used to incarcerate political prisoners but during World War 2, it became a death camp where more than 41,000 Jews were slaughtered before US troops liberated it on April 29, 1945.
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Today some 800,000 visitors from around the world visit the camp each year.
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Police in Bergen have contacted the Ministry of Culture to clarify how the port can be transported to Germany, where cultural authorities there eagerly await its return.Â
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"It is a relief to me that this original evidence of the Nazis' cynicism and contempt for humans has been rediscovered," Karl Freller, head of the Bavarian Memorial Foundation, said in a December statement after the gate’s discovery.Â
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