North Korean leader Kim Jong-un and Choe Ryong-hae, vice-chairman of the central committee of the Workers' Party, arrive for the official opening of the Ryomyong residential area in Pyongyang in this April 13, 2017, file photo,. AP

North Korean leader Kim Jong-un remained out of public sight Saturday, as the reclusive nation's tightly controlled media focused their coverage on the founding anniversary of its armed forces.

They have carried no report on Kim's public activities since April 11, sparking speculation that the 36-year-old might be critically ill.

Pyongyang's propaganda outlets instead hyped the 88th anniversary of the birth of the Korean People's Revolutionary Army (KPRA) that falls on April 25.

The official Korean Central News Agency detailed the history of the KPRA that dates back to the anti-Japanese people's guerrilla army formed by Kim Il-sung, the late grandfather of the current leader. Korea was under Japan's colonial rule at that time.