A Prison Service spokesperson said: “Police are investigating an attack on a prison officer at HMP Belmarsh yesterday.
“Violence in prison will not be tolerated and we will always push for the strongest possible punishment for attacks on our hardworking staff.”
Rudakubana is serving life in jail for murdering Alice da Silva Aguiar, nine, Bebe King, six, and Elsie Dot Stancombe, seven, at a Taylor Swift-themed dance class last year.
He poured boiling water over the prison officer, who was taken to hospital as a precaution but only suffered minor injuries.
Sky News understood the prison officer was taken to hospital as a precaution and was discharged the same day and is expected to return to work next week.
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