A fire was started at HMP Ranby during an ongoing disturbance which saw 120 inmates refused to return to their cells, The Prison Officers' Association (POA) said.
A spokesman for the Prison Service said minor damage was sustained and there were no injuries to staff or prisoners.
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A widespread frost across the UK as temperatures fall below freezing under clear skies.
After a vote tainted by reports of ballot-box stuffing and forced voting, Putin said Russia was ready to 'cooperate' with Britain.
Largely dry elsewhere tonight with a widespread frost and icy stretches