Four people died during a gunfight on Saturday evening between two armed groups at Falongkhyang area near Rowangchhari-Ruma border in Bandarban, said police.
Earlier on Sunday, the unidentified bullet-hit bodies were recovered from the bank of the Sangu River in the upazila.
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The identities of the deceased or the armed groups could not be known yet and, said Jerin Akter, superintendent of Bandarban Police at a press briefing on Sunday.
The bodies were recovered from the spot and will be sent for autopsy, she said.
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Jerin said local people spotted the four bullet-hit bodies in the area in the morning and informed police.
According to locals, around 4 pm Saturday some armed men dumped the bodies after firing bullets in the area.