Malaysian authorities are searching the Andaman Sea for dozens of missing Rohingya refugees after a boat carrying them sank near the Thai-Malaysian border last week, killing at least 21 people.

Eleven people have been confirmed dead after a boat carrying Rohingya migrants sank near the Thailand-Malaysia border, Malaysian authorities said Monday. About 70 people were believed to have been on board the capsized vessel.

A large wave hit the vessel on Monday, causing it to capsize in "about five or seven minutes", according to the governor of the Red Sea region.