A police constable killed his two children by feeding them poison before consuming it himself at PWD Colony, Mangalpet in the city on Saturday.
The deceased are Vinod, 38, his son Edson, 10, and daughter Jennifer, 7.
Vinod, a constable of the internal security division of the Bengaluru police, had come home for Christmas. He killed his children and committed suicide when his wife had been to the market.
Vinod and his children were rushed to the district hospital in a serious condition and breathed their last as they failed to respond to treatment.
The reason for the suicide pact is yet to be ascertained. The Market police have registered a case and are investigating.
Published 31 December 2017, 12:54 IST