Hashem Abedi, 28, inflicted "life-threatening" injuries on the officers at HMP Frankland in County Durham on Saturday. He is being held at the jail for his role in the deadly bombings eight years ago and his latest attack has outraged many, including former prison governor Ian Acheson. Mr Acheson, who carried out a review of Islamist extremism in jails in 2016, called Abedi "the second most dangerous prisoner in the UK" and claimed he should be left in total isolation because "we don’t have the death penalty". "The only other alternative is extreme custody - if it turns him mad then so be it," he told the Times.