JINDO, South Korea (AP) — The informal briefing by a South Korean coast guard rescuer started calmly enough. He stood on a stage in front of relatives of those missing from a sunken ferry, explaining how divers trying to find their loved ones are hampered by poor visibility and can venture only so deep.

Less than an hour later, Saturday’s meeting had unraveled. A few dozen relatives rose from the gymnasium floor and surged toward the stage, hurling rapid-fire questions — and a thick, rolled-up wad of paper — at the officials, who stood mostly silently, their heads bowed. One man tried to choke a coast guard lieutenant and punch a maritime policeman, but missed.