The captain of the sunken South Korean ferry has been charged with manslaughter, reports say.
韩国世越号沉船船长因过失杀人罪被起诉。
Lee Joon-seok, 68, is accused of leaving the ship as it was sinking while telling passengers to stay put, reports Yonhap news agency.
He was among the first to be rescued by coast guards at the scene.
The Sewol ferry disaster on 16 April killed 281 passengers, most of whom were high school students. Another 23 are still missing.
Besides Mr Lee, three crew members - the chief engineer, the chief mate and the second mate - are also being charged with manslaughter. If convicted, they could face life imprisonment.
"The [four people charged] escaped before the passengers, leading to grave casualties," prosecutor Ahn Sang-don told journalists.
Prosecutors have indicted another 11 crew members for negligence.
Only 172 passengers survived the sinking of the ferry, including 22 of the 29 crew members.
Structural fears
The authorities have also arrested several people who were not on the ferry at the time of sinking.
These include five officials of the ferry owner, Chonghaejin Marine Company, and an employee of a private safety device inspection company.
The latter is suspected of conducting poor inspections of the ferry's safety equipment.
South Korea, meanwhile, is looking to reform its safety and emergency response system in the wake of the ferry's sinking.
President Park Geun-hye said on Tuesday that the government would soon release details of this move, said Yonhap.
She has previously apologised for the way the government handled the incident, amid questions over the initial rescue effort.
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