Prisoners in jail holding Britain's most dangerous extremist jihadis share illegal mobile phones by flushing them down the LOO

• Inmates at HMP Whitemoor in Cambridgeshire passed devices between cells
• The flushed phones were first encased in plastic bags in the 'bizarre' scheme
• More than 20 prisoners in a special unit set up for terrorists were involved 
• Lee Rigby's killer Michael Adebolajo is held in a similar unit in County Durham 
• He and hate preacher Anjem Choudary were among the centre's first inmates
• Units set for HMP Full Sutton near York and HMP Long Lartin in Worcestershire 

Inmates at a prison branded 'Jihadi Jail' have been passing mobiles between cells by flushing them through sewage pipes. 

Prisoners of a segregation unit holding convicted terrorists used a 'linked system' of pipework to move the contraband devices from one cell to another at HMP Whitemoor in Cambridgeshire.

More than 20 inmates of the category A prison's most dangerous were found to be involved.

Inspectors called for improvements in security after inmates were found to be passing phones between cells

Phones were encased in waterproof bags attached to a string before being flushed, sources told the Mirror Online. 

One prison source said: 'This plot was absolutely bizarre. It shows how far inmates will go to get hold of banned items like mobiles.

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Inmates of a special centre at HMP Whitemoor set up for convicted terrorists flushed phones down toilets to move them between cells

'With the terror background and connections many of them have, it is extremely concerning that they gained access to mobiles in this way.' 

The plot was uncovered by governors at the category A prison, where at least four in 10 inmates are Muslim.

Pipes leading from one cell’s toilet to the next allowed convicts to fish phones out with coat hanger wire.

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Phones were encased in plastic bags before being flushed through a network of pipes that ran between cells

If the phone failed to flush, prisoners pulled the device up by a string and tried again.

An inspection discovered the plot, which was exposed on a report by the Independent Monitoring Board last week. 

Inspectors said 'Illicit mobile telephones can be passed from cell to cell via the toilet system.' 

There are fears of radicalisation at the so-called Jihadi Jail, which holds convicted terrorists. 

They called for security reviews and improvements at the unit, which holds more than 20 'unruly' prisoners.

The plot was uncovered during an inspection at the unit, which holds more than 20 'unruly' prisoners

The Ministry of Justice said: 'Progress remains to be made but HMP Whitemoor has already taken action to improve security.

'This includes intelligence-led searches for contraband and the introduction of new technology to find and detect mobile phones.'

This latest scandal at the jail follows a legal secretary and female warder falling in love with killer prisoners.

The pair then tried to smuggle drugs into prison for the inmates. 

The jail has suffered past smuggling scandals – including a legal secretary and a female warder who both fell in love with killer inmates and tried to bring in drugs for them.

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Left, Lee Rigby's killer Michael Adebolajo and, right, hate preacher Anjem Choudary are held in a similar unit

Lee Rigby's killer Michael Adebolajo and hate preacher Anjem Choudary were among the first inmates at three special 'jihadi jails', which have been dubbed prisons within prisons.

The pair were held in a special unit at HMP Frankland in Country Durham, with centres also expected to open at HMP Full Sutton near York and at HMP Long Lartin in Worcestershire in the coming months.

The centres were set up to isolate jihadists in the hope of stopping radicalisation among the wider prison population.