in Maulijagran village on the outskirts of the city, police said.
The deceased were identified as Karrappan, his wife Mani and their two sons Kaliar (15) and Langresh (17). The family hails from Tamil Nadu.
Eye witnessess said they saw them foaming at the mouth when they reached their house.
Police suspect it to be a case of food poisoning. A case had been registered.