North Korea has threatened military action against South Korea, accusing them of sending drones across the border.
The drones reportedly dropped propaganda leaflets over Pyongyang, the North Korean capital, sparking anger in the country.
North Korea claims the drone flights happened three times and has warned that any further intrusions will be met with force.
This latest incident adds to the growing tension between the two Koreas, which have been engaged in a series of escalating actions in recent months.
