India, March 21 -- The teenage daughter of North Korean leader Kim Jong Un has driven a tank during army training supervised by her father, the pair's latest joint public appearance fueling outside speculation that the girl is groomed as Kim's heir.

The official Korean Central News Agency reported Friday that Kim oversaw an offensive tactical drill involving tank units and infantry troops a day earlier and called for completing war preparations.

Video and images released by state media showed Kim's daughter sticking her head out of the driver's hatch of a moving, olive green tank while her smiling father sat on top with three soldiers.

Observers say the girl's position clearly showed she was driving the armored vehicle, her first such ...