WEIMAR – President Barack Obama says the Buchenwald concentration camp "is the ultimate rebuke" to those who deny the Holocaust.

Obama on Friday visited the Nazi-era camp where 56,000 people died. He toured the memorial with German Chancellor Angela Merkel and survivor Elie Wiesel. They laid roses at a memorial.

Obama said people today have a duty to confront those who deny such concentration camps existed.

A somber Obama told reporters that his great-uncle helped liberate a nearby satellite camp, Ohrdruf, just days before other U.S. Army units overran Buchenwald. Obama says his great-uncle returned from war and was unable to speak of the horrible scene.

Obama says the victims and the perpetrators of the camp alike were humans and everyone must stand guard against a repeat.

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