Seen above is a North Korean guard post near Paju, Gyeonggi Province, Oct. 9. Yonhap

North Korea said Sunday it has ordered its artillery corps near the border with South Korea to fully prepare to shoot after the North threatened a "horrible disaster" over the alleged flight of drones over its capital.

North Korea claimed the South had sent unmanned drones over Pyongyang three times this month.

In a statement carried by its state media, Kim Yo-jong, the powerful sister of the North's leader Kim Jong-un, said the North was ready to take a "strong corresponding retaliatory action" in case drones carrying anti-Pyongyang materials are flown again into the North, warning that the "attack time" can come at any time.

In response, South Korea's defense ministry said any attempts by the North to harm its people would result in the end of the Kim regime.

On Friday, North Korea's foreign ministry claimed that South Korean drones carrying leaflets were detected in the night skies over Pyongyang on Oct. 3, as well as Wednesday and Thursday of this week, and threatened to respond with force if such flights occur again.

South Korea's Defense Minister Kim Yong-hyun initially denied that the military had sent any drones across the border, but the Joint Chiefs of Staff later said it could not confirm whether the North's claims were true. (Yonhap)