Parthasarathi Mukherjee, assistant teacher of Langulia High School near here in Birbhum district, was beaten up in in presence of the members of the managing committee, teachers and students.
Police rescued Mukherjee from the mob and took him to Suri hospital in a highly critical condition. As his condition did not improve till the evening, he was shifted to a private hospital in Durgapur, the police said.
President of the school managing committee Sanjit Roy said an incident happened before the summer vacation and he was beaten up in connection with that.
School officials on condition of anonymity said Mukherjee, who is popular among students, had punished a boy of class VIII before the summer vacation.
His guardians had complained to the authorities that the offence was negligible and the boy was tortured by senior students at the instigation of Mukherjee.
It had been decided that the matter would be discussed as soon as possible after reopening of the school, the officials said.
