Less than a month after the cease-fire was signed, a rebel leader’s hometown was attacked. Goran Tomasevic/Reuters NAIROBI, Kenya — The ranks of displaced people have swelled to nearly 900,000, close to a tenth of the entire population. Humanitarian groups warn that millions could go hungry if fields remain unplowed before the coming rainy season. Aid workers themselves are on the run, hiding ever deeper in the bush to escape attack. Fighting has continued in South Sudan, both rebels and government officials say, in spite of the cease-fire agreement last month that was meant to bring peace to the young nation while a broader political solution was found. Negotiators from the two sides will meet again in Ethiopia this week. But in a sign of the continuing hostilities, the hometown of Riek Machar, a former vice president […]