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The head of Germany's security service has told the ³ÉÈË¿ìÊÖ that the attacks on Paris are just the beginning of a "terrorist world war".

"We are very concerned that people who fled IS are falling into the hands of Islamists," Hans-Georg Maassen told the ³ÉÈË¿ìÊÖ's Berlin correspondent Jenny Hill.

"IS is looking at Europe as a single enemy," he said.