The search for the remaining bodies on a sunken South Korean ferry could wrap up by the weekend.

South Korea's prime minister says officials must work with "resolve to finish searches" by Saturday to help ease the suffering of relatives of missing people.

About 270 bodies have been recovered from the submerged ferry, and more than 30 people are still unaccounted for.    

The ferry sank in the early hours of April 16. Most of those on board were high school students.