Gurgaon, Sep 10 (PTI): Hundreds of people today staged a demonstration outside the Ryan International School in Gurgaon demanding a CBI probe into the murder of a seven-year-old school boy and set afire a liquor shop near the school.

Police used batons to quell the protest and detained 20 protestors. Cameras of some photojournalists were also damaged during the protest.

Some of the demonstrators threw liquor bottles inside school premises to vent their ire against the school management, police said. The liquor shop is barely 50 metres away from the school.

They demanded that the school should be shut until a CBI probe is ordered into the incident.

"The Gurgaon Police had to use mild lathicharge to disperse the agitators. The police detained over 20 protestors found agitating outside the school," Ravinder Kumar PRO Gurgaon Police said.

The protestors alleged that school drivers and conductors often consume alcohol from the liquor shop in their free time.

Praduman Thakur was found murdered with his throat slit inside the toilet of Ryan International School on Friday, triggering public outrage.

Gurgaon Police arrested school bus conductor Ashok Kumar in connection with the case.

Kumar was inside the toilet, waiting for any student to come inside with the motive of sexual assault. The deceased was the first student who entered the toilet, the police said.