U.N. debates sanctioning North Korea

SEOUL, South Korea — North Korea has restarted its weapons-grade nuclear power plant and fired off its sixth short-range missile, news reports said Wednesday, deepening a standoff with world powers following its latest nuclear test.

The missile launches over the past two days came as the U.N. Security Council debated possible new sanctions against the isolated communist nation for its nuclear test on Monday. Retaliatory options were limited, however, and no one was talking publicly about military action.

South Korea's mass-circulation Chosun Ilbo newspaper reported that U.S. spy satellites have detected steam coming from a nuclear facility at North Korea's main Yongbyon plant, indicating the North is reprocessing spent nuclear fuel rods to harvest weapons-grade plutonium.

Its report quoted an unnamed official. South Korea's Defense Ministry and the National Intelligence Service — the country's main spy agency — said they cannot confirm the report.

The North had said it would begin reprocessing in protest over international criticism of its April 5 rocket launch.

North Korea is believed to have enough plutonium for at least half a dozen atomic bombs. The North also has about 8,000 spent fuel rods which, if reprocessed, could allow the country to harvest 6-8 kilograms (13-18 pounds) of plutonium — enough to make at least one nuclear bomb, experts said.

North Korea test-fired three short-range missiles Tuesday, including one late at night, from the east coast city of Hamhung, according to South Korea's Yonhap news agency. South Korea's spy chief confirmed two other missiles were launched Monday, but reports put the number at three Monday for a total of six.

More could be planned.

North Korea has warned ships to stay away from waters off its west coast through Wednesday, suggesting more test flights.

Details of Monday's nuclear test may take days to confirm. Russian defense officials said the blast was roughly as strong as the bombs dropped on the Japanese cities of Hiroshima and Nagasaki in World War II and was stronger than North Korea's first test in 2006.

In New York, U.N. diplomats said key nations were discussing a Security Council resolution that could include new sanctions against North Korea.