Watkins, 46, was sentenced to 35 years in prison for a string of 13 child sex offences – including the attempted rape of a baby – in December 2013.
The disgraced frontman, who is currently being held at HMP Wakefield, is said to have been injured when he was “roughed up” by three prisoners who threatened to stab him in neck.
The hostage situation is said to have ended when specially-trained riot officers arrived, throwing stun grenades into the cell as they attempted to end the siege and free Watkins.
According to sources, Watkins was knifed in the neck as part of the standoff and rushed to Leeds General Infirmary for life-saving treatment.
The siege, which is said to have lasted six hours, took place shortly after 9am on Saturday morning.
Speaking to The Sun, the source said: “Watkins was attacked today by three pretty heavy-duty cons.
They got hold of him on B-wing and dragged him into a cell where they roughed him up and barricaded themselves in.
“He was screaming and was obviously terrified and in fear of his life.
They put the whole wing on lockdown and then sent in riot teams.
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