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Official: No radioactive particles found 
Can't find evidence expected from successful nuclear detonation

Results from an initial air sampling after North Korea's announced nuclear test showed no evidence of radioactive particles that would be expected from a successful nuclear detonation, a U.S. government intelligence official said Friday.

The test results do not necessarily mean the North Korean blast was not a nuclear explosion, the official said, speaking on condition of anonymity because he was not authorized to disclose the sampling results.

Nonetheless, the readings reinforce uncertainty about the size and success of Monday's underground explosion, which North Korea has trumpeted as a nuclear test. It also keeps alive lingering questions about whether it was in fact a nuclear blast. Data from seismic sensors has already indicated the explosion was smaller than expected, but that is not a conclusive finding on the question of whether the explosion was nuclear.

The Chinese and Japanese governments have done their own air sampling and found no trace of radioactive material, officials from both countries said Friday. A Japanese government official said his country sampled air over the Sea of Japan, as well as rainfall and ground-level air on Japanese territory and found nothing.
   
   

The U.S. intelligence official described the U.S. results as the State Department announced that Secretary of State Condoleezza Rice will travel to China, South Korea and Japan next week to discuss steps to be taken to pressure North Korea to drop its nuclear efforts and to assess the security situation in the region.

Rice's trip is the next step in the U.S. diplomatic offensive at the United Nations and with Pyongyang's neighbors.

Members of the U.N. Security Council agreed Friday on the wording of a resolution that would clamp sanctions on the communist country. The draft, which U.S. officials said they hoped would be approved on Saturday, would authorize non-military sanctions against the North, and says that any further action the council might want to take would require another U.N. resolution.

It also eliminates a blanket arms embargo from a tougher, previous draft, instead targeting specific equipment for sanctions including missiles, tanks, warships and combat aircraft.

State Department spokesman Sean McCormack said that on Rice's trip, "she's going to be talking about the passage of that resolution certainly, but really what comes after. She's going to be talking about how to go about actually implementing that resolution."

At the White House, press secretary Tony Snow said the Bush administration's analysis of North Korea's claim of a nuclear test was continuing and is covering a wide range of data in an attempt to reach a conclusion about whether it is valid.

"We still do not have a definitive statement on it," he said. "They still think the analysis that they're doing will take another day or two."

McCormack said "the jury is still out" on the Korean test, adding, "You don't know what size device they were hoping to explode."

The air sample was taken Tuesday by a specialized aircraft, the WC-135, flying from Kadena air base in Okinawa, Japan. It apparently took the sample over the Sea of Japan, between the Korean mainland and Japan.

In Beijing, a government official said Friday that Chinese monitoring also has found no evidence of airborne radiation from the test-explosion. The official with the State Environmental Protection Administration said China has been monitoring air samples since Monday.

"We have conducted air monitoring and found no radiation in the air over Chinese territory so far," said the official, who requested anonymity because he was not authorized to publicly release the information. The official declined to explain how the Chinese monitoring was conducted.

The U.S. intelligence official said an initial result from testing of the U.S. air sample became available late this week. He said a final result would be available within days but the initial finding is considered conclusive.

It was not immediately clear whether the WC-135 took additional samples after the Tuesday effort.

The U.S., which has sought tough steps in the United Nations that could leave the door open to a blockade or other military action, has had to give ground to gain support from China and Russia. Those countries, along with South Korea, have been reluctant to abandon diplomatic efforts to resolve the standoff.

On Wednesday, Bush indicated that he saw little distinction between an actual nuclear test by North Korea and its announcement of one.

"The United States is working to confirm North Korea's claim, but this claim itself constitutes a threat to international peace and stability," Bush said.