The South earlier found two unsophisticated unmanned aerial vehicles -- about one metre long, two metres wide and painted pale blue -- that had crashed near the border with the North.
The two camera-equipped vehicles took hundreds of pictures -- albeit of low quality -- of border areas and the capital Seoul, including the presidential palace, according to the South's defence ministry.
The military found today another drone of similar design and size in the eastern county of Jeongseon, about 130 kilometres south of the heavily fortified border, Seoul's defence ministry spokesman said.
Seoul's military saw the drones as "substantial threats" and would come up with ways to detect them, Kim said without elaborating further.
The first drone was discovered in the border city of Paju on March 24 and the other one was found in the border island of Baengnyeong on March 31, when the two Koreas traded fire across the tense sea border.
The North dropped 100 shells across the maritime border during a live-fire drill, prompting Seoul to fire back about 300 volleys into North Korean waters.
North Korea displayed a set of very basic-looking drones during a huge military parade held in Pyongyang last July to celebrate the 60th anniversary of the end of the Korean War.
And in March last year, state media reported leader Kim Jong-Un overseeing a military drill using "super-precision drone planes."
The North yesterday jeered at the discovery of drones that apparently flew freely over key areas in Seoul -- but offered no clear denial or confirmation as to its involvement.
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