One of the men accused of killing Fusilier Lee Rigby has been injured during a violent incident in prison.

Woolwich murder suspect Michael Adebolajo  lost two teeth as he was restrained by officers at Belmarsh jail in south-east London.

It is understood several officers were called  in to help after Adebolajo began acting violently on Wednesday, and he was  injured during the subsequent melee in the prison’s high-security wing.

Last night the Metropolitan Police said it  had started an investigation. No arrests have been made.

Adebolajo, from Romford, east London, is one of two men accused of murdering Fusilier Rigby outside Woolwich barracks on May  22.

When he appeared in court last month charged  with the murder, he complained about his treatment at the hands of prison  staff.

During the June 5 hearing via  video-link  from the prison, he was flanked by prison officers in full  riot gear. Belmarsh  staff asked for him to be handcuffed on the basis he was ‘unpredictable’ and had  refused to comply with their orders.

The judge, Mr Justice Sweeney, terminated the  video-link after Adebolajo launched into a series of rants against prison  staff.

The unit in which he is being detained has  the highest security classification in the country, and holds  notorious terror  suspects and dangerous felons.

Inmates have included Al Qaeda  preacher Abu  Qatada until his deportation earlier this month, and  fanatic Abu Hamza, who was  extradited to the US last year. The cost of  keeping each inmate in the unit is  estimated at £65,000 a year.

Accusations: Adebolajo is accused of hacking Fusilier  Rigby (left) to death together with Michael Adebowale, 22 (right, in a court  drawing). The two suspects are due to stand trial on November 18

Violent incident: Adebolajo lost two teeth as he was  restrained by officers at Belmarsh jail (pictured) in London

A November 2009 inspection report on  Belmarsh criticised the ‘extremely high’ amount of force used to control inmates at the prison, and said large numbers of inmates claimed they  had been  intimidated by prison staff.

A Prison Service spokesman said: ‘The police  are investing an incident which took place at HMP Belmarsh on July 17.

‘It would be inappropriate to comment while  the investigation is ongoing.’

A Scotland Yard spokesman said: ‘We  can  confirm that an allegation of assault was passed to the Metropolitan Police on  July 17 by Belmarsh Prison. An investigation has been  started.’

Jail: It is understood several officers were called in  to help after Adebolajo began acting violently on Wednesday, and he was injured  during the subsequent melee in the prison’s high-security wing

Crowds of wellwishers line the street as the funeral  cortege of Fusilier Lee Rigby drives away from Bury Parish church on July 12  following a funeral service attended by 800

Rigby, 25, a father of one from Middleton,  Rochdale, died  from multiple wounds after he was attacked in the  street.

The Prime Minister and thousands of  mourners  attended his military funeral last week, at which his  two-year-old son Jack  wore a T-shirt bearing the words ‘My Daddy My  Hero’.

Adebolajo is charged with murder and  possessing a revolver. He is also accused of the attempted murder of two police  officers.

His alleged accomplice, Michael Adebowale,  22, is  charged with murder and possession of a firearm.

Read more: DailyMail