Jail bosses fear a race war could break out behind bars after ­hardened killers set up protection groups against Muslim convicts.

The Sunday People can reveal that ­governors have been given an urgent ­security warning about one new network called Death Before Dishonour.

The group – calling themselves DBD for short – have formed to protect ­themselves against what they claim is an increasing risk from Muslim inmates.

But it raises the threat of further meltdown in our crisis-hit jails.

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