Four prison staff have been injured during an outbreak of violence at one of Britain's most secure facilities.
The incident at Belmarsh in south-east London was triggered by an inmate who refused to hand over a laptop computer, the Prison Service said.
Four members of staff needed hospital treatment - officials refused to say how many prisoners were involved or what time the incident happened.
Belmarsh holds some of Britain's most high-profile terror suspects.
Computer tampering
A Prison Service spokeswoman said: "A prisoner was suspected of tampering with his Access To Justice laptop and refused to hand it over, punching a member of staff.
"An altercation ensued involving a member of staff and prisoners."
The official said the incident was brought quickly under control.
Some inmates are allowed computers to work on their legal cases but are denied internet access.
It was reported last September that videos of hostages being beheaded were found on a laptop used by radical preacher Abu Hamza, who is detained at Belmarsh.
Judges sometimes direct that prisoners must have access to a computer because CPS paperwork is only available in DVD format.
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