Students hold signs with messages of hope for the return of their missing friends who were on the Sewol ferry, which sank in the sea off Jindo, at Danwon High School in Ansan April 17, 2014. Rescuers struggled with strong waves and murky waters on Thursday as they searched for hundreds of people, most of them teenagers from the same school, still missing after the South Korean ferry capsized 36 hours ago. [Photo/Agencies]

 Passengers rescued by South Korean maritime policemen

 Rescued passengers reunite with families

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