A boat carrying scores of Rohingya people aboard capsized in the Bay of Bengal close to Bangladesh's border with Myanmar on Monday, a police official said.
Dozens of people were reported missing, Xinhua news agency reported.
The UN has raised the number of Rohingya refugees in Bangladesh to 537,000.
The crisis began on August 25, when an insurgent group of the Rohingya Muslim minority staged a series of attacks on police and army posts in the Rakhine state.
The Myanmar military responded with large-scale offensive triggering the mass migration.
