The Prison Service says there has also been a disturbance at Rye Hill Prison, near Rugby in Warwickshire, but it was unrelated to the Maidstone Prison incident.
"There was a passive demonstration at HMP Rye Hill where around 60 offenders refused to return to their cells," she said.
"This was peacefully resolved within a few hours."
More top news
Beating England 45 - 47, New Zealand will now play neighbours Australia in the final on Sunday.
Rocky has been held in Sweden for weeks as police investigate his alleged involvement in a fight.
A better end to the day with late sunshine