Investigators considered the cases of 50 alleged guards at the camp, NBC News reported, and have decided that 30 of them should be charged.
Officials in the southwestern state of Baden-Wuerttemberg said in a statement the cases have been passed from special investigators to state prosecutors, who can bring the charges.
Most of the suspects live in Germany, NBC News reported.
More than 1.1 million Jews and others were killed in gas chambers or died from starvation and forced labor at Auschwitz in Poland.
More than 6,000 workers served there but until 2011, German courts only prosecuted Nazi war criminals if evidence indicated they had personally committed atrocities.
A ruling in 2011 made it easier for prosecutors to charge Nazis who were an accessory to killings, NBC News reported.
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