The mishap occurred last evening when Upendra (7) entered the pond along with buffaloes after grazing them in a field, police said, adding that Upendra' sister Triveni (11) also drowned in a bid to save her brother.
The bodies have been fished out from the pond, police said.
Upendra and Triveni were students of class III and VI, respectively.
A case of accidental death case has been registered by police.
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