The Prison Service has refused to comment on the detail of what is claimed to have happened when Woolwich murder suspect Michael Adebolajo was assaulted in prison on Wednesday.
A spokeswoman said: "The police are investing an incident that took place at HMP Belmarsh on July 17. It would be inappropriate to comment while the investigation is ongoing."
More top news
The former US president has Tweeted six of the top 10 most liked tweets ever - with current president Donald Trump not making the list.
By the time all the dead are counted, it will have grown to a great chorus of grief, Africa Correspondent John Ray reports.
For years we’ve been told to stay out of the hot summer sun. So how much sun is too much? Kylie Pentelow looks at the latest advice.