At least sixteen policemen were injured in an attack by a group of fishermen in the Meghna river on Friday evening.
Bikash Chandra Dey, in charge of Hizla River Police Unit, is among the injured.
They are now receiving treatment at a local hospital, said Sayed Hossain, duty officer of Hizla River Police Unit.
Hizla upazila executive officer Mohammad Tarek Hawladar, said a team, including river police, conducted a drive in the Meghna river sanctuary in Hizla upazila this evening.
While the law enforcers tried to lift a net in the river, the fishermen, who were engaged in netting fish, attacked them, leaving 16 cops injured, the officer said.
Police had to open fire on eight rounds of bullets to bring the situation under control.
Action will be taken against those involved in the attack, said Yunus Miah, officer-in-charge of Hizla Police Station.