The rape-and-murder of the Class X student in Kotkhai area of Shimla district sparked state-wide outrage. Her body was recovered from a nearby forest two days later.
Addressing mediapersons here, Director General of Police (DGP) Somesh Goyal said, "We have technical, forensic, physical, circumstantial and confessional evidence against these accused and the SIT is in the process of collecting more evidence to strengthen the case."
Police said all the accused had been living in Kotkhai area for quite some time.
Goyal said the crime was not pre-planned. All the accused were drunk when the picked up the girl in Raju's vehicle, he said.
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Eighty-four people were questioned and call details of 28 people were screened in the course of the investigation, the police chief said.
Referring to some photographs which have been doing the rounds of social networking sites and apps, the DGP appealed to people not to circulate unverified news and photographs related to the case on social media.
Such posts can attract civil and criminal liability, he said, apart from making the case more complicated.
He also requested people of the state to have patience and trust in the police.