The gangs, often led by fanatics who are serving sentences for terrorism, are recruiting violent prisoners to be their ‘foot soldiers’, the report reveals.

Inmates who refuse to convert to Islam and join their ranks are being ostracised or attacked.

Muslim extremists are recruiting gang members in prisons, ordering them to convert to Islam

In 2017, it emerged that terrorist gang Naweed Ali, Khobaib Hussain and Mohibur Rahman, who called themselves the ‘three musketeers, had hatched a plot to bring carnage to the streets of Britain with a pipe bomb after they met in prison

The report, which examined three unnamed high security prisons in England, also describes how the gangs are instilling fear in staff.

They are particularly keen to target offenders who are already in street gangs and therefore have a ‘propensity for violence’, it adds.

Experts have previously warned that UK prisons have become a breeding ground for extremists to spread their behaviours and ideas.

Two years ago three men who had met in the high security Belmarsh prison in south-east London were convicted of plotting a terror attack

The trio, who dubbed themselves the Three Musketeers, had planned to use a meat cleaver and pipe bomb on police and military targets.

This latest report was undertaken by the Ministry of Justice with researchers at the University of Birmingham to better understand the nature of these gangs.

Following interviews with 83 offenders and 73 staff members, it concluded that the gangs ruled by ‘violence, bullying and intimidation.’

One prisoner told them: ‘There is an underlying pressure for people to convert and join the gang. The tactic they use is to befriend someone when they come in. If they don’t convert they will then start spreading rumours about them, that the person is a snitch, so that they will be ostracised. Then the beatings will follow.’

Last year, Pastor Paul Song told how extremist Muslim gangs came to dominate Brixton jail

Mr Song said extremists had interrupted his bible group to praise Lee Rigby’s killers Michael Adebolajo (left) and Michael Adebowal