Students, teachers and all officials were taken to a nearby ground after the headmaster of Dumdum's Kendriya Vidyalaya got a bomb threat call at 9.22 AM, they said.
"The call was made from a landline number. The caller said the bomb was inside a student's bag," a police officer said.
A police team from Dumdum Police Station and bomb disposal squad rushed to the school after receiving a call from the headmaster, he said.
"We are searching all possible places where a bomb can be kept as well as bag of every student of the school," the officer said.