The mob damaged government vehicles, laid siege to a police station and blocked the Hindustan-Tibet National Highway for hours demanding a CBI probe into the case.
The minor girl, a class X student, was allegedly raped and murdered at the Kotkhai area of Shimla district on July 4. The body of the victim was recovered from the nearby Halila forest two days later.
The mob alleged that the real culprits were not arrested as they belonged to influential families.
The mob allegedly roughed up the Shimla Superintendent of Police (SP), damaged his vehicle and those of the Sub- Divisional Magistrate (SDM), Theog and Station House Officer (SHO), Theog, who took shelter inside the police station to escape its fury.
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Taking note of the sensitive nature of the case, the chief minister, who returned to the state capital today after a two-day visit to Kullu, took stock of the situation and ordered a CBI probe into the case.
Terming the protest and violence at Theog as "politically motivated", Singh said a Special Investigation Team (SIT) was formed to nab the culprits and it had succeeded in its task.
Singh said the government had decided to refer the case to the Central Bureau of Investigation (CBI), so that there was no doubt in anyone's mind regarding its intention to ensure a free-and-fair probe.
The police had registered a case under sections 302 (punishment for murder), 376 (punishment for rape) of the IPC and section 4 of the Protection of Children from Sexual Offences Act (POCSO) Act in connection with the incident.