The owner of the building, in which the Central Model School is housed on a lease, was asked by a court to shift, which triggered today's demonstration by students and their parents.
The demonstrators blocked a portion of the AJC Bose Road near Beckbagan from around 11.50 AM, a senior officer of the Kolkata Police said.
The blockade that continued till 3.20 PM affected the west-bound traffic, forcing the police to enforce several diversions of the route.
"There has been a legal battle between the landlord and the school management for a very long time. Now the Supreme Court has ordered that the school be moved to another location. So the old school building was shut down," he said.
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The police claimed that taking advantage of the situation some local miscreants started pelting stones at the police personnel posted there in which additional OC of Beniapukur Police Station Aloke Kumar Sarkar and two other constables were injured.
On whether a school student was injured or not, a senior officer said, "We do not have any information regarding this. Our officer has been hospitalised and being treated for his injuries while the two constables were released after initial treatment."
Senior Kolkata Police officers including DC South Murli dhar rushed to the place, the IPS said adding that the students and their parents withdrew the blockade after state education minister Partha Chatterjee assured them of a meeting tomorrow in this connection.