South Korea -- Hundreds of people are missing after a ferry capsized today off the coast of South Korea.
Four deaths have been confirmed so far and more than 280 people are missing; 174 rescues were confirmed.
Many of the passengers were students from the same high school on a field trip.
It could be South Korea's worst maritime disaster in more than two decades.
It's not clear why the ferry capsized in calm conditions, but survivors head a loud noise before the vessel started to go down.
The rescue operation continued into the night, lit by flares, as relatives of the missing prayed for good news.
Survivors wrapped in blankets were taken to a gymnasium that was used as a makeshift shelter while others were taken to the hospital for medical treatment.
Buses were used to carry parents from the high school to the port town where the rescued passengers were being taken.