Thirteen prison officers taken to hospital after assault at Feltham youth jail
Twenty staff at the youth jail in west London were hurt in separate incidents, said the Prison Service.
The perpetrators will face adjudication hearings over the next few days and could face prosecution by police.
A Prison Service spokesman said: “A completely unacceptable series of assaults on staff at Feltham over the weekend led to 20 officers receiving injuries – with 13 needing hospital treatment.
“Our sympathies are with those hard-working and committed staff, who deserve to be able to carry out their jobs without facing this kind of behaviour.
“We will never tolerate violence against our staff and will push for the strongest possible punishment, which could lead to them spending more time behind bars.”
It is understood the injured officers have since been discharged from hospital, reports Sky News .
The chairman of the Prison Officers' Association, Mark Fairhurst, tweeted: "The violence against staff at HMP Feltham over the weekend is not acceptable.
"Replace the term ‘children' with ‘violent young criminal’ and you more accurately describe what @POAUnion members in the juvenile estate face.
"We will support staff and push for prosecutions."
Feltham Young Offenders Institution is made up of two parts – Feltham A, which holds 15 to 18-year-olds, and Feltham B, which holds young adults aged 18 to 21.
The A unit has capacity for 180 young people, while 360 young adults can be held in unit B.