Dr Adrian Grounds, Ian Brady's medical witness, said there had been "periodic conflicts with other patients".
The hospital's QC refers to the removal of "his weapon - his pen".
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The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.
The foreign secretary has criticised internet and social media giants for failing to detect and remove extremist material posted online.