Riot police have been sent in to deal with unrest at a prison in Hertfordshire, amid claims that two wings are “out of control”.

The Ministry of Justice has confirmed that specially trained staff are dealing with an ongoing incident at The Mount.

According to Alex Cavendish, a prison affairs academic and blogger, staff shortages may be to blame for the unrest.

He explained: “The technical term is that the staff have lost control of two wings. What ‘lost control’ means is that the prisoners are basically rioting, in layman’s terms.”

The two wings affected in the Category C prison are believed to house a total of 227 prisoners.

The Mount is a facility for prisoners receiving training and resettlement support towards the end of their sentences.

A 2015 inspection found it was performing well.

Mr Cavendish has claimed he warned the prison was “on the brink of a meltdown” only days ago.