Masked gunmen entered a grocery shop and shot its owner in Begumganj upazila of Noakhali on Saturday night.
Begumganj Model Police Station Officer-in-Charge (OC) Md Shamsuzzaman said the incident took place at Mizan Store in Jinu Market, Amanullapur Union.
The victim, Mizanur Rahman, 34, is the son of Ahmad Ullah of Purba Joynarayanpur village in the union.
According to police, citing local residents, a group of 20 to 25 armed, masked men suddenly entered the shop while Mizanur was serving customers and opened fire on him. He suffered gunshot injuries to his abdomen, hands and legs and fell to the ground.
He was taken to Begumganj Upazila Health Complex and Noakhali General Hospital. As his condition deteriorated, he was referred to Dhaka for advanced treatment.
OC Shamsuzzaman said police had visited the scene and the injured shopkeeper at the hospital. The victim had sustained shotgun pellet injuries, he added.
Police are conducting operations to identify and arrest those involved. Legal action will be taken after a written complaint is received, the OC said.
Meanwhile, Begumganj upazila Jamaat-e-Islami chief Md Abu Zayed, claiming Mizanur as a supporter of the party, said the attack had been planned. He called for the immediate arrest of those responsible.