(CNN) — A Boston-area man, who was planning to kidnap children, lock them in a basement dungeon, rape and eat them, should be imprisoned for at least 27 years, federal authorities said in court documents filed this week.

Geoffrey Portway pleaded guilty in May to distribution and possession of child pornography and solicitation to commit a crime of violence, according to court documents. He is scheduled to be sentenced on September 17.

“Portway has pled guilty to some of the most vile and heinous crimes known to our society,” federal prosecutors wrote in a sentencing recommendation.

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