IG*GETTY Jihadis are being taught how to carry out beheadings

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Extremists are carrying out mock beheadings and taught how to slit the throat of a bound captive, according to prison sources. The shocking revelations claim that would-be terrorists are being given lessons in how to carry out mass killings during supposed “evening classes” – the Daily Star Sunday has reported.

GETTY Murder lessons were being carried out inside prisons

Held in cells – fanatics inside category A prisons such as Belmarsh, Whitemoor and Long Lartin – are using diagrams and models to teach jihadi recruits how to construct a booby trap, make the poison Ricin and create explosives from just garden fertiliser. The government believes around 1,000 prisoners are at risk of being radicalised. English jails currently hold 131 Islamist inmates convicted of terrorist offences.

GETTY Belmarsh is one the prisons accused of having lessons being carried out

One senior prison source said: “We have caught terrorist prisoners showing other inmates how to carry out an execution. When we ask what they are doing, the inmates claim they are messing around – but it’s clear that they are involved in something far more sinister. “There are now so many hardened terrorists in top-security prisons in England that in some cases they are ‘running’ wings.” Our insider added: “The terrorists recruit and radicalise young Muslim men and tell them that the only people who will give them a chance in the future are radical Islamists. “We have seen them reenacting beheadings and found diagrams of IEDs. Prisons are now the main recruiting grounds for terrorist groups.”

The fight against ISIS Fri, November 18, 2016 The battle against ISIS militants (also abbreviated as Daesh, ISIL, IS and Islamic State) continues in the Middle East. Play slideshow Getty 1 of 183 Forces battle against ISIS

One case revealed how prisoners learned how to hide a bomb inside a torch and use a mobile phone to detonate a explosive device. Glyn Travis, assistant general secretary of the Prison Officers Association, said: “We have concerns Islamist extremists are deliberately getting custodial sentences in order to target vulnerable prisoners.”

IG Jihadis are being trained up ahead of joining brutal groups such as ISIS