Sentencing, Judge Norman Wright told the pair: "This was a flagrant abuse of power and a gross breach of trust."
He added: "The room has been described as a cell but it seems to me it was akin to a prison cell from a third world country, not the home of an 11- or 12-year-old living in this century in this country."
More top news
This evening an image of Salman Abedi taken from CCTV on the night he committed the attack, has been released
The Duke of Cambridge also laid a wreath to honour the victims before kick-off.
The mother of one of the Manchester attack victims has told of the distressing moment she found her daughter being treated after the attack.