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Prison staff carrying riot shields leave HMP Birmingham in Winson Green, Birmingham, central England on December 17, 2016. British riot police, late Friday evening, regained control of a prison after more than 300 inmates took part in a 'serious disturbance' that led to a partial lockdown. A specialist 'Tornado Team', which handles prison riots, was sent in to deal with the incident at the privately run prison in Birmingham, central England. / AFP / OLI SCARFF (Photo credit should read OLI SCARFF/AFP/Getty Images)

Prison staff carrying riot shields leave HMP Birmingham in Winson Green, Birmingham, central England on December 17, 2016. British riot police, late Friday evening, regained control of a prison after more than 300 inmates took part in a 'serious disturbance' that led to a partial lockdown. A specialist 'Tornado Team', which handles prison riots, was sent in to deal with the incident at the privately run prison in Birmingham, central England. / AFP / OLI SCARFF (Photo credit should read OLI SCARFF/AFP/Getty Images)
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AFP OLI SCARFF

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G4S staff leave HMP Birmingham after a disturbance at the prison yesterday. (Photo by Joe Giddens/PA Images via Getty Images)

G4S staff leave HMP Birmingham after a disturbance at the prison yesterday. (Photo by Joe Giddens/PA Images via Getty Images)
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PA Images Joe Giddens - PA Images

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BIRMINGHAM, ENGLAND - AUGUST 20: G4S prison officers walk past Birmingham Prison in Winson Green on August 20, 2018 in Birmingham, England. Birmingham Prison, formerly Winson Green Prison, has been taken over by the government's Ministry of Justice after inspectors said it had fallen into a 'state of crisis'. Extra staff and a new governor are to be brought in to take over from private firm G4S. (Photo by Christopher Furlong/Getty Images)

BIRMINGHAM, ENGLAND - AUGUST 20: G4S prison officers walk past Birmingham Prison in Winson Green on August 20, 2018 in Birmingham, England. Birmingham Prison, formerly Winson Green Prison, has been taken over by the government's Ministry of Justice after inspectors said it had fallen into a 'state of crisis'. Extra staff and a new governor are to be brought in to take over from private firm G4S. (Photo by Christopher Furlong/Getty Images)
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Getty Images News Christopher Furlong

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BIRMINGHAM, ENGLAND - AUGUST 20: A welcome to HMP Birmingham sign is displayed outside of Birmingham Prison in Winson Green on August 20, 2018 in Birmingham, England. Birmingham Prison, formerly Winson Green Prison, has been taken over by the government's Ministry of Justice after inspectors said it had fallen into a 'state of crisis'. Extra staff and a new governor are to be brought in to take over from private firm G4S. (Photo by Christopher Furlong/Getty Images)

BIRMINGHAM, ENGLAND - AUGUST 20: A welcome to HMP Birmingham sign is displayed outside of Birmingham Prison in Winson Green on August 20, 2018 in Birmingham, England. Birmingham Prison, formerly Winson Green Prison, has been taken over by the government's Ministry of Justice after inspectors said it had fallen into a 'state of crisis'. Extra staff and a new governor are to be brought in to take over from private firm G4S. (Photo by Christopher Furlong/Getty Images)
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Getty Images News Christopher Furlong

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Masked police personnel leave Tottenham Court Road in central London on April 27, 2012, after a man was arrested after causing a disturbance in an office building in central London. Police arrested a man who witnesses said had threatened to blow himself up in an office building in central London, forcing a busy shopping street to be sealed off in a three-hour standoff on Friday. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/GettyImages)

Masked police personnel leave Tottenham Court Road in central London on April 27, 2012, after a man was arrested after causing a disturbance in an office building in central London. Police arrested a man who witnesses said had threatened to blow himself up in an office building in central London, forcing a busy shopping street to be sealed off in a three-hour standoff on Friday. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/GettyImages)
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AFP MIGUEL MEDINA