South Korea: North Korea's 'provocation' is a 'serious challenge to international peace and security'

The U.N. Security Council will meet Wednesday morning in New York to discuss North Korea's claim that it tested a hydrogen bomb, two diplomats told CNN.

South Korea's vice foreign minister, Lim Sung-nam, said during an emergency meeting that North Korea's "provocation is in clear violation of Security Council resolutions and a serious challenge to international peace and security." Japanese Prime Minister Shinzo Abe condemned the alleged test, saying it was a "serious threat" to Japan's security and "clearly violates the UNSC resolution and is a serious challenge to the nuclear non-proliferation efforts."

A U.S. official told CNN it could take several days to acquire enough data to determine if North Korea did in fact conduct a successful underground hydrogen bomb test. Previous nuclear tests have used plutonium weapons.

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