Tusshar (16) was found unconscious by some students in his school bathroom and was taken to a hospital yesterday. He was later referred to the GTB Hospital where he was declared brought dead.
CCTV footage revealed that he had a fight with some students near the washroom.
Three of the students with whom he had a fight have been detained, said a senior police officer, adding that they were minors.
They are being questioned.
Family members of the deceased alleged that he was thrashed by the students.
A medical board will conduct post-mortem on the body later today.
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