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A DERANGED student cut off his own penis with a knife while apparently high on party drug miaow miaow.

The spaced-out teenager, 19, mutilated himself after stabbing his mother at their home in Haywards Heath, West Sussex, it was claimed yesterday.

Police raced to the scene after the 46-year-old woman called 999. Once there, they found her son hanging out of a bedroom window with blood pouring from his wounds.

Both were rushed to hospital with life-threatening injuries in the early hours of December 29. Yesterday, the mother was said to be in a stable condition at the Royal Sussex County hospital.

The young man was also in a stable condition at University College London hospital, where surgeons are thought to have successfully sewn his penis back on.

It is thought he took mephedrone shortly before the incident.

A source close to the family said of the man: “He is normally a lovely lad and very bright. But unfortunately, he had started dabbling in drugs.

“He had come home from university for Christmas. It looks like he took mephedrone and completely flipped out attacking his mum and then himself.

“When the police arrived they found him hanging from a window and then discovered he had cut off his penis.”

Police were yesterday investigating an allegation of assault on the mother.

Det Insp David Springett of Sussex police said: “At this stage we are not looking for anyone else in connection with this incident.”