"In the morning, after finding the female bear's carcass floating in the well, some people passed on information to us. We reached the spot and fished out the bear along with its two dead cubs," Anupur Divisional Forests Officer D S Kanesh told PTI.
He said that the female bear was adult while its cubs were around three to four months old.
The three mammals might have come in search of food or water and slipped into the well, he said.