About 200 people fleeing warfare are dead after a boat crossing the Nile River sank, a South Sudanese military official said today, as fighting between rebels and government forces moved closer to the national capital. Warfare in the world's newest state has displaced more than 400,000 people since mid-December, with the front lines constantly shifting as loyalist troops and renegade forces gain and lose territory in battles often waged along ethnic lines. Lieutenant Colonel Philip Aguer, the South Sudanese military spokesman, said there was fighting about 70 kilometres north of the South Sudanese capital of Juba. Heavy fighting also erupted in Malakal, the capital of oil-producing Upper...