Nikhil (8) and his sister Lalita (5) drank water from an earthen pot in their house last night and later complained of severe abdomen pain and vomit, they said.
They were taken to a hospital where they died, police said.
"A dead lizard was found in the pot and it is suspected that the water the children drank was poisonous," the police said, adding, the bodies have been handed over to family members.