Four bodies were found floating in the Baral River in Sluice Gate area under Charghat upazila of Rajshahi on Friday.
Samit Kumar Kundu, officer-in-charge of Charghat police station, said that local people spotted the bodies in the morning and informed police.
It was not clear whether the bodies came from the upstream of the river or those were dumped in the area after killing, the OC said.
Police were working to recover the bodies.
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