WASHINGTON (AP) -- Western officials are closely watching signs that North Korea's unpredictable dictator Kim Jong Il may be gravely ill.
Incapacity of the man North Koreans call the "Dear Leader" would have serious implications for the international effort to get North Korea to abandon nuclear weapons.
There was no sign of Kim at a closely watched parade Tuesday marking the 60th anniversary of North Korea's founding, and the country's state media was silent about his absence. His last reported public appearance was in mid-August.
"There is reason to believe Kim Jong Il has suffered a serious health set back, possibly a stroke," a Western intelligence official said, speaking on condition of anonymity to describe sensitive intelligence gathering.
Another official said rumors and reports of a possible health setback were based in part on intelligence gathered by other nations.
White House press secretary Dana Perino said Tuesday that the Bush administration was watching the situation, but, "There's nothing I can provide for you now."
She called North Korea an "opaque society" that it is important to gain information about. "This situation is no different," she said.
A senior U.S. official said rumors had been circulating for weeks about the state of Kim's health and his control over North Korea's highly centralized government.
That official said the United States has no independent confirmation that Kim is ill, but that Kim's absence lends credence to reports that he is suffering and may no longer be in a position to command the absolute authority he had wielded.
"What we do know is that he was not at the military parade," the official said, speaking on condition of anonymity about the administration's internal assessment of the situation. "That is quite unusual and reinforces a lot of what we've been hearing."
At the State Department, spokesman Sean McCormack declined to comment on the reports but did say the United States had recently seen a decline in "outputs" from North Korea on the denuclearization process, particularly on establishing a method to verify Pyongyang's actions.
"We don't necessarily have a good picture into the decision-making processes of the North Korean regime, but we can see very clearly outputs or lack of outputs," he told reporters. "Over the past several weeks, we have not seen outputs in terms of their agreement to a verification regime."
"We encourage, continue to encourage the North Korean regime to focus on that output" so the six-party talks on disarmament can move forward, McCormack said.
The health rumors began circulating in mid-August. Shortly thereafter, North Korea announced it was suspending the disablement of its Yongbyon nuclear reactor, a key step in abandoning its atomic weapons program that it agreed to take in negotiations with China, Japan, South Korea, Russia and the United States.
North Korea's powerful military is known to have been opposed to the measure, and many analysts believed it was proceeding mainly due to Kim's support for the process and the backing of moderates in his foreign ministry.
When North Korean diplomats notified their U.S. counterparts of the suspension, they did so in a note that explained the move was being taken "due to pressure from the relevant agencies," according to people familiar with its contents.
Kim has held absolute power in the Stalinist regime, and the wording of the note set off alarms that his control over the disarmament scheme may be in question.
Intelligence officials note that one of several family members or senior military officials might step in if Kim were incapacitated.
(This version CORRECTS to say Kim's last reported appearance was in mid-August, to reflect media reports of appearance on Aug. 14.)