North Korean leader Kim Jong-un's younger sister has apparently lost her job taking care of security for her brother after several blunders during events she organized, a source here claimed Wednesday.

The source said one lapse occurred during a youth rally organized by Kim Yo-jong on May 14. State-run TV showed footage of the North Korean leader waving at the audience of youngsters, but since it was impossible to take a photograph with tens of thousands of people, Kim Jong-un moved from one stage to another taking photos with different groups.

As he moved from one stage to another, the cheering crowd suddenly rushed toward him, with some youngsters grabbing his arm or standing next to him holding his hand.

Workers Party secretary Choe Ryong-hae and the head of the youth league tried to stop the crowd but failed, the source said.

As the crowd surrounding Kim grew uncontrollably, bodyguards in military uniform rushed to Kim's side and formed a ring around him, and he exited the scene.