Adverse weather conditions have hampered efforts to put out the fire and find the missing. (Photo: Yonhap/VNA)

They are Bien Van H, 45; Do S, 23; Pham Van N, 25; Phan Tam S, 30; and Nguyen Van C, 24.

Earlier, the force said that a fire broke out on the 29-tonne ship carrying eight crew members at around 3:18 am (local time) in waters about 74 km southeast of Udo Island near Jeju.

Two Koreans aboard have been rescued so far, while another is unaccounted for, with search operations still under way.

Adverse weather conditions have hampered efforts to put out the fire and find the missing./.

Five Vietnamese sailors missing in fishing boat fire in waters off RoK

Five Vietnamese sailors went missing as a fishing boat carrying eight crew members caught fire in waters off the resort island of Jeju of the Republic of Korea (RoK) on March 4, reported Yonhap News Agency.