A combat police force was posted in strength in and around the Christ Church Girls High School in the northern part of the city after the guardians went on a rampage in the school office and damaged furniture.
The guardians, joined by locals, laid a siege to the school's main gate holding the school authorities responsible for 11-year-old Oindrilla Das' death and demanding that the principal resign and be handed over to them.
"We appeal to you not to take law in your hands and let us act," he said.
Chief minister Mamata Banerjee talked to the girl's mother over phone and consoled her assuring she would look into it.
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Principal Helen Sarkar, who along with six other teachers were confined within the school due to agitation, apologised to the guardians and assured that an inquiry would be held into the student's death.
''The incident is unfortunate and we will take all steps to ensure that such incidents do not recur,'' the principal said over a microphone from the first floor balcony of the school, urging the guardians to keep patience.
Additional CP (Belghoria) Biswajit Ghosh, DC (Hq) Kallon Gonai and senior police officers were camping at the school in view of high tension.
No classes were held due to agitation.