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A disabled teenage boy has bled to death after having his genitals cut off while he was tied to a pole in the street.

The 15-year-old had been missing for almost a day and his body was found by a milkman in China on Wednesday morning.

Police arrested a 39-year-old man with a history of mental illness who admitted to killing the boy.

However another suspect involved in the horrific incident is yet to be found.

The brutal castration saw the teen bleed to death in the street in Zhouzhi county, Xi'an Province.

(Image: AsiaWire)

When he was found his hands were tied to a gas pipe above his head.

He also had his trousers pulled down and a pool of blood surrounded him on the floor, the milkman told Sina .

Local police confirmed confirmed the 15-year-old's surname was Ren and said he was mentally disabled.

Ren, who was a student at a special needs school, had been living with his grandmother when he went missing.

He was found 1.5 miles away from home.

His grandmother said: "He liked to play outside, but he always knew the way back home."

Xi'an police investigators said the boy's top was removed and his trousers were pulled halfway down.

His genitals were mutilated in what appeared to be a hate-crime style murder but his exact cause of death has yet to be determined.

Local authorities have identified two suspects and arrested one of them, 39-year-old Wang, 15 hours later.

The other suspect is still at large.

The police said Wang also had a history of mental illness but declined to share more details about the case.