Peter McParlin, chairman of the Prison Officers Association has said that the Ministry of Justice (MoJ) should not have allowed their response to an alleged violent jail incident involving Woolwich murder suspect Michael Adebolajo to "run on for two days".
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.