Did French police miss chance to warn Charlie Hebdo staff of attacks?

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Claim that threats from Chérif Kouachi - one of the two gunmen - outside magazine three months before shootings were not acted on.

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Police were warned that one of the Charlie Hebdo gunmen had turned up three months before the attack to say it would be targeted, it has been reported, as French film stars leant their weight to the satirical magazine’s anniversary edition a year, reports The Telegraph.