The head of school inspection service Ofsted has warned that the "Trojan Horse" campaign to impose radical ideas on Birmingham schools has "gone underground" but hasn't gone away.

Sir Michael Wilshaw, national head of the inspection service, has written to Education Secretary Nicky Morgan to warn: "The situation remains fragile".

And he said he was concerned that Birmingham was failing to ensure "children are not being exposed to harm, exploitation or the risk of falling under the influence of extremist views."

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