In a single moment on the Mediterranean Sea, hope turned into horror - hundreds of people crowded on a boat. They were in the waters off Libya. They were heading for Europe, it's believed, when their boat capsized. NPR's Sylvia Poggioli is tracking what's called the Mediterranean's worst tragedy in living memory.
SYLVIA POGGIOLI, BYLINE: Around midnight Saturday, the Italian Coast Guard received a distress call from a vessel some 70 miles north of the Libyan coast. UNHCR spokeswoman Carlotta Sami said the caller reported too many people were on board.