The series of French police misses that could have warned Charlie Hebdo staff of attacks

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.

The magazine’s release came as fresh details emerged of alleged security failings in the run-up to the attacks, which have prompted the widows of two victims to file criminal complaints.