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.
More top news
The safety of the plane was put at risk by distraction caused by monitoring the drones, a report into the incident has found.
People reported that their cash 'disappeared into thin air' as one described it as an 'absolute disaster'.
Ian Paterson was convicted of 17 counts of wounding with intent and three counts of unlawful wounding.