The latest violence has sparked concerns about the German Salafist scene. Islam expert Herbert Müller of the Federal Office for the Protection of the Constitution explains why the extremists pose a threat.

DW: Salafism is a general term often used to describe all the dangerous elements in the German Islamist scene. What's really behind that term?

Herbert Müller: Salafists are people who think they should live like their pious ancestors – that is they want to follow the example set by the prophet and the three following generations.

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