SEOUL, South Korea (AP) — More than 100 people were still unaccounted Wednesday several hours after a ferry carrying 476, most of them high school students, sank in cold waters off South Korea’s southern coast, killing at least two and injuring 14, officials said.

There were fears of a big jump in the number of deaths, as dozens of boats, helicopters and divers scrambled to rescue passengers who had been on the ferry travelling to the southern island of Jeju. One rescued passenger said he believed that many people had been trapped inside the ferry when it sank.