Fire broke out on Thursday morning at the prestigious Hindu school in Kolkata.
"The fire broke out at the computer department in the third floor of Hindu school in north Kolkata," Fire brigade sources said.
"Four fire tenders rushed to the spot and doused the fire within an hour," officials said.
The cause of fire has not been ascertained.
However according to the school sources the students were evacuated and there was no injury due to the fire.