BERLIN—German prosecutors have charged a 100-year-old man with 3,518 counts of being an accessory to murder on allegations he served during World War II as a Nazi SS guard at a concentration camp on the outskirts of Berlin, authorities said Tuesday.

This photo shows the words “Arbeit Macht Frei” (Work Sets You Free) at the main entrance of the Sachsenhausen Nazi concentration camp on the international Holocaust remembrance day in Oranienburg, Germany. Markus Schreiber/AP Photo
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