Nuclear test threat strains Korea border

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SEOUL -- Tensions mounted over North Korea's threat to test its first atomic bomb, with shots ringing out yesterday along the border with South Korea and with Japan warning of harsh sanctions if Pyongyang goes nuclear.

With a test expected as early as today, the U.N. Security Council issued a stern statement Friday urging North Korea to abandon its nuclear ambitions and warning of unspecified consequences if the isolated, communist regime doesn't comply.

Jittery nations have warned that a test would unravel regional security and could trigger an arms race.

A midday incursion yesterday by North Korean troops into the southern side of the no man's land separating North and South Korea stoked the unease.

South Korean soldiers rattled off 40 warning shots at the five communist troops who crossed the center line of the demilitarized zone, the inter-Korean buffer.

It was not clear whether the North Korean advance was intended as a provocation or was an attempt to go fishing at a nearby stream, an official at South Korea's Joint Chiefs of Staff said on the condition of anonymity, citing official policy. No one was hurt, and the North Koreans retreated.

Such border skirmishes are rare. The incursion yesterday was the second this year, the official said.

Meanwhile, world powers were stepping up diplomatic efforts to avert a nuclear test. Japanese Prime Minister Shinzo Abe was to visit Beijing today for talks with Chinese President Hu Jintao and then proceed to Seoul tomorrow for talks with South Korean President Roh Moo-hyun.

A State Department spokesman, Kurtis Cooper, said yesterday that the United States was concerned about North Korea's threat to test its first atomic bomb and that the department was closely monitoring the tensions.

Also yesterday, South Korea's nuclear envoy announced he will visit Beijing tomorrow for two days of talks with Chinese officials about the threatened nuclear test.