Lucknow, Sep 8 - Police in Uttar Pradesh's Mathura town Tuesday said they had solved the murder of a teenaged girl whose body was found stuffed in a bag in a coach of a Mumbai bound train, and arrested her uncle from New Delhi.

The girl, identified as Manjot Singh, was murdered by her uncle Gurbagh Singh, a resident of Delhi, they said.

During interrogation, singh admitted to killing his niece as she was HIV positive.

'The girl's father and mother, who also were HIV positive, died two years ago and since then she was living with her uncle. Gurbagh Singh suspected her parents to be of loose character due to which they got infected with the deadly virus,' Superintendent of Police B.D.Paulson told IANS over telephone.

An electrician by profession, Singh strangulated the girl Sep 1 and stuffed the body in a bag which he put in the AC coach of the Maharashtra Sampark Kranti Express, which runs from New Delhi to Mumbai. The unattended bag was found by the police at the Mathura railway station.

'A team of Mathura police arrested him from New Delhi and he has been brought to Mathura for further interrogation,' Paulson added.