Sezhiyan was on his way to the government primary school at Nonakuppan village near here on his two-wheeler when he was waylaid by the gang riding two-motorcycles.
It is suspected that some previous enmity in real estate business in which the teacher was reportedly engaged in, could have been the cause of the crime.
A case has been registered, police said, adding, they were on the lookout for the culprits who are absconding.