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Düsseldorf is a city in the west of Germany. It is the capital of the state of North Rhine-Westphalia. The city has a population of around 600,000 people. Peter Kurten was a German serial killer who was active in the city of Düsseldorf in the early 1920s. He was known as the "Düsseldorf Vampire". He was responsible for the deaths of at least nine people.