N. Korea reportedly tests 2nd nuke device

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By Andrew Salmon

SEOUL -- North Korea on Monday appeared to have detonated a nuclear device, its second such test in three years.

The U.S. Geological Survey said it detected a magnitude-4.7 earthquake in the region, and South Korea's Cabinet convened in an emergency session, according to Yonhap, South Korea's semi-official newswire.

Yonhap also said the North had confirmed the test.

Trading on South Korea's stock market was briefly suspended when the benchmark index plunged after the news was reported.

Experts here have long been predicting a second nuclear test.

North Korea first detonated a nuclear device in October 2006, but the test is thought to have produced a lower explosive yield than had been hoped for.

As North-South relations struggle, the North is busily engaged in accelerating tensions in the region - with harsh rhetoric, the detention of U.S. and South Korean citizens, and a recent ballistic-missile test.

Although North Korea surprised experts by not warning that it was about to test, analysts said they doubted the detonation was aimed to coincide with the aftermath of the apparent suicide of former South Korean President Roh Moo-hyun.

Mr. Roh had been the most conciliatory of South Korean presidents, and relations with the North went downhill after when his five-year term ended and voters elected hard-liner Lee Myung-bak as his successor.

"I think the timing is just coincidence; the North Koreans have a number of reasons to do this," said Dan Pinkston, who heads the International Crisis Group's Seoul office.