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“To intentionally create a situation where that could have been the outcome, it’s depraved and mind-blowing,” Willis said.

"I want to commend the three victims in this case for their immense courage in speaking out about the cruel and depraved abuse they suffered, and going through the criminal justice process," she said.

Mabel - not her real name - is exposed to some of the most depraved and horrific images online and said her family were her main motivation for carrying out her analyst role.

The judge, Lord Braid, told the killers: "You have all been convicted of what can only be described as a brutal, depraved and, above all, wicked murder."

Political commentator Guy Benson told the channel: "It's sick, it's depraved, and the message there is violence is the answer."