The government has vowed to introduce emergency legislation to prevent terrorists being automatically freed from prison half way through their sentences.
Justice secretary Robert Buckland also said those jailed for terror offences will have to appear before the parole board before they can be released.
He made the announcement a day after Sudesh Amman, 20, was shot dead by police after stabbing two people in an apparent Islamist-inspired attack in Streatham, London.
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