Sudan vows to teach South Sudan 'a final lesson'

The African rivals slide closer to war over their contested border. U.N. chief urges them to avoid a ruinous conflict.

KHARTOUM, Sudan — Sudan and its southern rival slid toward a ruinous war Thursday, with fighting continuing along their contested border and Sudanese President Omar Hassan Ahmed Bashir threatening to teach the world's newest country "a final lesson by force."

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