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Politicians have even declared war after an unknown assailant ploughed into crowds in Berlin.

Police had arrested a man from Pakistan called Naved B who they claim was approved for asylum after arriving in the country in February, however it has since been claimed he is not thought to have been the driver after DNA tests.

Now in a veiled attack on Chancellor Merkel’s open-door refugee policy, Klaus Bouillon of Mrs Merkel's CDU party said told Saarland radio: "We must state that we are in a state of war, although some people who want to see only the good can not see.

Bouillon announced intensified security measures amid fears there could be more attacks today.