Bihar Chief Minister Nitish Kumar said that an SIT was formed by the district police to probe the incident while one of the accused persons was arrested.
Terming the incident as a 'heinous crime', Kumar told reporters that efforts were on to arrest all the accused persons, two of whom have been identified.
The culprits would not be spared, he said.
The minor girl of Lakhochak village was gangraped when she had gone out of her home on Friday night to answer the call of nature, Chanan police station in-charge Sunil Kumar Jha, who is a member of the SIT, said.
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She was taken to district Sadar hospital from where she was referred her to Patna Medical College and Hospital.
Hospital sources said that she suffered huge blood loss and a fracture in her pelvic region.
The girl gave a statement from her hospital bed to the police identifying two of the accused.
One of them was arrested yesterday from Lakhochak village, Jha said.
The other accused identified by the rape victim was also accused in the murder case of his elder brother's wife last year and was absconding in that case too, Jha said.
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