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SEOUL (Reuters) - North Korea is digging tunnels at a site where it has launched two nuclear tests, suggesting it is preparing a third, the South's Yonhap news agency said on Sunday, a development which would trigger concern across the region.
Tensions rose on the divided peninsula when 46 sailors were killed in an attack in March on a South Korean naval vessel. North Korea, which has denied responsibility, shelled the southern island of Yeonpyeong in November, killing four people and sparking fears of possible all-out war.