London children under the age of ten are being "trained to be junior jihadis" in a disturbing new sign of the growing extremist threat in the capital, City Hall's policing supremo warned today.

Deputy Mayor Stephen Greenhalgh said that the way some children were being radicalised was "horrendous" as he revealed that both he and Boris Johnson have been briefed on cases in which primary pupils have been subjected to propaganda and "extremist ideology" by their families.

His comments, ahead of a counter-terrorism summit at City Hall today, came as a new report added to the concerns about terrorism by warning that at least 40 British fighters involved in the conflict in Syria and Iraq are likely to attempt "blowback" terrorist attacks when they return to this country.

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