Seoul | The South Korean government said on Tuesday no unusual activity had been detected in North Korea after unconfirmed reports described leader Kim Jong-un as in fragile condition after heart surgery.

The presidential Blue House said it had no information about the rumours on Kim's health. Speculation often surfaces about North Korea's leadership based on attendance at important state events. Kim, who is in his mid-30s, missed the celebration of his late grandfather and state founder Kim Il Sung on April 15, the country's most important holiday.

AAP