North Korean state media made no mention on Wednesday of new appearances by leader Kim Jong Un, a day after intense international speculation over his health was sparked by his absence from a major celebration last week.

South Korean and Chinese officials and sources familiar with U.S. intelligence have cast doubt on reports that Kim is gravely ill after a cardiovascular procedure, while the White House said it was closely monitoring the matter.

Speculation about Kim's health first arose due to his absence from the anniversary of the birthday of North Korea's founding father and Kim's grandfather, Kim Il Sung, on April 15.