The death toll in the school van accident at Channankara near here rose to four with a five-year-old child succumbing to injuries on Tuesday.
Preliminary investigations have found that the vehicle that plunged into a canal was driven by its cleaner, who did not possess a licence.
Three children had died yesterday when the van carrying 25 primary school students fell into a canal at Channankara, about 25 km from here.
Kerala government had announced a solatium of Rs 5 lakh each for the families of the deceased children and decided to bear entire expenses of the children receiving treatment for injuries suffered during the mishap.
Nearly 15 children are still undergoing treatment.
Police have registered a case of homicide with the cleaner Shibin, driver Jefferson and the school management as accused.
According to police sources, investigations revealed that though the driver Jefferson was in the vehicle, it was being driven by cleaner Shibin at the time of the accident.
There had also been violation of guidelines concerning school vehicles issued by the government after a similar accident claimed seven lives in the city in February.
In yesterday's mishap, the van was packed with children beyond its prescribed capacity, sources said.
The intensity of the tragedy would have been greater had it not been for the local people who rushed to save most of the children.