One-year-old twins were on Monday evening burnt to death in their house in Ajigo sub-location, Siaya County.
The infants, Jane Anyango and June Anyango, had been left asleep in their house in Ngula village, while their mother Judith Achieng went to the nearby market.
Bondo sub-county Deputy County Commissioner Samson Diero Akatch said the infants were left under the care of a five-year-old boy who is suspected to have lit a tin lamp.
"The fire was noticed by a passer-by who had come to fetch water from River Yala. He raised the alarm before unsuccessfully attempting to break into the house to rescue the babies," said Akatch.
The deceased children's mother Milka Akinyi, who had gone to Ndori market when the incident occurred, said she left the deceased Barrack Ochieng with his seven-year-old elder sister at home.