The border post of Phu Quy seaport and police from Phu Quy island district said they are still investigating the cause of why the boat, owned by a 44 year-old man named Ngo Hai, suddenly erupted in flames.
Three injured people from central Ha Tinh province,were provided with emergency services in the island district.
So far, the rescue force has not found the missing people, who were identified as Ngo Thanh Hung, Vo Tam and Phan Van Quyen from Long Hai commune.