SEOUL, South Korea -- North Korea on Monday claimed it has performed a successful nuclear test, according to that country's official Korean Central News Agency (KCNA).

South Korean government officials also said North Korea performed its first nuclear test, the South's Yonhap news agency reported.

The apparent nuclear test was conducted at 10:36 a.m. (1:36 a.m. GMT) in Hwaderi near Kilju city, Yonhap reported, citing defense officials.

"The field of scientific research in the DPRK (North Korea's official name) successfully conducted an underground nuclear test under secure conditions on October 9 ... at a stirring time when all the people of the country are making a great leap forward in the building of a great prosperous powerful socialist nation," KCNA reported.

In Washington, White House Press Secretary Tony Snow said, "We can't confirm independently, although we're aware of the reports."

A senior U.S. official said China was given a 20-minute warning ahead of the test and in turn told the United States, Japan and South Korea about getting the advance notice.

A U.S. military official told CNN that "something clearly has happened," but the Pentagon was working to fully confirm the report.

Other senior U.S. officials said they also believed the test took place, citing seismic data that appears to show one.

The U.S. Geological Survey Web site recorded a light 4.2-magnitude earthquake in North Korea at 10:35 a.m., about 385 kilometers (240 miles) northeast of the North Korean capital, Pyongyang.

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AP @ cnn.com