North Korean leader Kim Jong-Un has gone missing (Details)

 North Korean leader Kim Jong-Un, believed to be 30 or 31, has not been seen since September 3 when he attended a music concert with his wife in Pyongyang.

Competing theories for his disappearance range widely from an extended rest period to a leadership coup, via a long list of possible illnesses and ailments including broken ankles, gout and diabetes.

The explanation with the most currency is a health issue that has left him temporarily incapacitated.

Kim was not listed by the state KCNA news agency among the officials who visited the mausoleum housing the remains of his father and grandfather -- an annual show of respect to mark Friday's anniversary of the ruling Korean Workers' Party foundation.

However, a floral tribute bearing Kim's name was presented to the two statues of Kim Jong-Il and Kim Il-Sung.

South Korea, which has largely distanced itself from the disappearance rumours, said it saw no indication that Kim was no longer in charge.

Unification Ministry spokesman Lim Byeong-Chul noted numerous reports in the North Korean state media of Kim exercising his authority.

"Judging from these, it seems that Kim Jong-Un is ruling normally," Lim said, adding that the government had no specific intelligence on Kim's health.

Kim's absence from the Kumsusan mausoleum visit was considered significant as he has attended each year since coming to power following the death of his father in 2011.

While he could still make an appearance later in the day, a complete no-show will likely send an already whirring rumour mill into overdrive.

Kim, a heavy smoker, has shown striking weight gain over the past year and recent TV footage had shown him walking with a pronounced limp.