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Rhondda Cynon Taf has the highest number of the most risky category D tips in Wales.

Blaenau Gwent council confirmed the landslip was a "singular wash-out of a former coal tip in the area", the Welsh government said, adding the tip was Category D, which has the most potential impact to public safety.

Paterson was recently given permission to move to a Category D open prison, causing anger and distress among his victims and their families.

One relative said it was "a kick in the guts" he would be moving to a Category D open prison, while a liason officer for one of the victims said they had not been informed so were unable to put forward ther views.

A Category D prison has minimal security and allows eligible prisoners to spend most of their day away from the prison on licence to carry out work, education or for other resettlement purposes.