INITIAL testing has failed to determine whether or not North Korea fired a nuclear device on Monday, a US official said yesterday.
"The first test results came in inconclusive," said the US official, who declined to be named. "They did not find anything that could confirm a nuclear device was detonated."
The official said additional tests were being conducted and results cou
ld be known in a couple of days.
North Korea claimed it had conducted a nuclear test on Monday, its second since 2006 and a move that was swiftly condemned worldwide and is likely to result in punitive measures against Pyongyang.
Asked whether he had any more information on precisely what had transpired on Monday, State Department spokesman Ian Kelly said he did not.
Earlier yesterday, the Vienna-based Comprehensive Test Ban Treaty Organisation said absolute proof that Monday's blast was Pyongyang's second nuclear test awaited findings of any radioactive particles and noble gases, expected next week at the earliest.
It said data so far showed Monday's blast resembled both an explosion and an earthquake.
The US Geological Survey reported at the time it had detected a 4.7 magnitude quake in an area close to where the test site was thought to be.