At least four suspected robbers have been beaten to death and two others sustained injuries in the district's Hatia upazila.
The identities of the deceased and the injured could not be known immediately.
Hatia police station OC Anisul Haque said: “A boat carrying the gang of 10-12 robbers reached Chairman Ghat around 12:30am Saturday. Sensing the matter, locals informed the police. Later, the Hatia police conducted an instant drive and captured four of the criminals.
“Acting on the information provided by the detained robbers, we launched a search for their cohorts, hiding in the area. But, the criminals came out of hiding and attacked the Chairman Ghat police camp, leaving three policemen injured.”
“Following the incident, locals chased the gang and gave the criminals a good beating. Four robbers died on the spot, two received severe injuries while the rest of the gang fled,” added the OC.
The injured policemen have been admitted to Noakhali Sadar Hospital.
The four bodies were also taken to the hospital for autopsy.