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A 41-year-old man ripped off his own penis while high on magic mushrooms.

The naked man was found screaming in the street at around 1pm on Tuesday by police responding to a burglar alarm at a school in Ypsilanti, in Michigan.

Officers discovered the man kneeling outside Ypsilanti Middle School, bleeding from the waist down with parts of his genitals ripped off.

The man, who had smashed a window at the school but taken nothing, was rushed to hospital along with his dismembered body parts, Police Sergeant Geoff Fox said.

"He really wasn't saying much at all - a lot of yelling and screaming," Fox said.

"He wasn't making sense. They couldn't really communicate with him in terms of constructive conversation."

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The man, from Columbus, Ohio, later told detectives he had bought hallucinogenic mushrooms earlier in the day while visiting friends near to the school.

Police said blood tests had been taken from the man, who does not have a history of mental problems or extensive drug use, to check if the mushrooms had been contaminated with another drug.

Sgt Fox added that the man is now recovering at University of Michigan Health System after his ordeal.

"In terms of vital signs, they were as low as they could go without being dead - I could only assume due to the blood loss and the shock and trauma to the body," he said.