As of now, 70 others have been rescued in the incident
At least 15 Rohingyas have died as a trawler carrying Rohingyas, capsized near Saint Martin's Island in the Bay of Bengal.
The trawler capsized en route to Malaysia early Tuesday.
Lt Commander Nayeemul Haq of Bangladesh Coast Guard's Saint Martin's Island station confirmed the deaths.
The deceased include three children and mostly women though their identities are yet to be confirmed.
As of now, 70 Rohingyas have been rescued and given primary treatment, the coast guard official said.
The death toll might increase as 30 to 35 others are still missing, he said quoting the rescued Rohingyas.
He said the trawler, presumed to carry more than 100 people, sailed for Malaysia from the Noakalia Para coastal region under Teknaf upazila in Cox's Bazar around 3am on Tuesday, and sank 3 nautical miles off the island later.
Lt Commander Nayeemul said on information, members of the coast guard went to the spot and started the rescue operation.
Meanwhile, divers pulled out the sunken trawler from the sea, he said.
All of the rescued Rohingyas will be brought back to Teknaf from the island in the afternoon, Nayeemul added.
Lt Col Abdullah Ibn Zaid, director of Inter-Services Public Relations (ISPR), said, alongside the coast guard ship Mansoor Ali, Bangladesh Navy ships -- Durjoy and Korotoa -- are also in the rescue operation.
Bangladesh has been hosting over 1.1 million Rohingya refugees in camps in Cox's Bazar. Of them, more than 730,000 Rohingyas crossed over to Bangladesh in the latest episode of exodus, which began in August 2017, fleeing violent persecution carried out by Myanmar security forces and civilians.
Each year thousands of Rohingyas try to go to Malaysia or Indonesia by sea, risking their lives in the perilous journeys.
Lured by traffickers, most people attempt the journeys before March, when the sea usually remains calm.