South Korea says it has found another suspected North Korean "drone", after finding two similar objects in recent weeks.
Seoul's defense ministry said Sunday its military found a drone of similar design to one found last week on an island on the border with North Korea. The latest find was in the northeastern South Korea, about 130 kilometers from the border with North Korea.
The defense ministry said it plans to investigate on the suspicion the North may be behind it. North Korea has offered no clear confirmation or denial of responsibility for the drones.
South Korea says an investigation determined the small, unmanned aircraft found Tuesday on Baengnyeong island was Pyongyang's.
South Korea's government has not commented on North Korea's purpose in operating the drone, though South Korean media reports say it was conducting surveillance during an artillery exchange.
Last Monday, North Korea fired 100 artillery rounds into the sea on the South Korean side of the maritime border, prompting Seoul to fire its own rounds back into northern waters. No one was injured in the exchange.
Tensions between the two Koreas have risen in recent weeks because of annual joint U.S.-South Korean military drills and a series of rocket and ballistic launches by Pyongyang.
The two Koreas remain in a technical state of war following their 1950s armed conflict, which ended in a truce and not a formal peace treaty.