BERLIN -- German authorities say they've apprehended a notorious elderly neo-Nazi and taken her to prison to begin serving her sentence for Holocaust denial. Police and prosecutors told the dpa news agency Monday that Ursula Haverbeck, 89, was picked up at her home in the town of Vlotho in central Germany.

Haverbeck, dubbed "Nazi-Oma" (Nazi grandma) by German media, was convicted of incitement last year in Verden state court and sentenced to two years in prison for denying the Holocaust, a crime in Germany.

She was supposed to report to prison last week but vanished, prompting a search for her. It was not immediately clear when she returned home.

Ursula Haverbeck (2nd R), repeatedly condemned Holocaust denier, is taken away by the police after she tried to attend a trial that started against a former Auschwitz guard on February 11, 2016 in Detmold, western Germany. Getty

Haverbeck was a chairwoman of a far-right training center that was shut down in 2008 for spreading Nazi propaganda. In a 2015 trial, she said Auschwitz was "not historically proven" to be a death camp, the Agence France-Presse reports. She also appeared on television and said the Holocaust "is the biggest and most sustainable lie in history."

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An estimated 1.1 million people were murdered at the Auschwitz camp between 1940 and 1945 before the Soviet army intervened, freeing the remaining 7,000 prisoners.