North Korean leader Kim Jong-un's sister Yo-jong was caught on camera behaving oddly during a military parade marking the Workers Party's 70th anniversary in Pyongyang.

She was seen repeatedly pulling faces and hiding between banners standing behind the podium during a live broadcast while her brother was speaking.

"Anybody else would have been executed immediately for such antics," a commentator here said.

Back on May 14, Kim Yo-jong was seen running around alone during a youth rally Kim Jong-un was attending, a government source here recalled.

During the rally organized by his sister, Kim Jong-un was surrounded by crowds who pawed his hands and arms, which was considered a serious security glitch.