A South Korean military source said today, Sunday, that some of the artillery shells recently fired by the North Korean army fell over the Northern Limit Line in the Yellow Sea, exacerbating tensions on the heavily guarded western border, which had witnessed previous naval clashes.

North Korea fired 200 artillery shells from coastal areas in the southwest of the country the day before yesterday, Friday, prompting South Korean forces on the islands of Yeonpyeong and Baengnyeong to conduct live-fire drills.

The South Korean news agency Yonhap quoted the source as saying that most of the North Korean shells fell in the buffer maritime zone, with some falling in waters about seven kilometers from the Northern Limit Line.

An official said the South Korean army is considering taking similar actions after North Korean artillery shells crossed the Northern Limit Line or the land near the actual maritime border.

North Korea conducted live-fire drills yesterday, Saturday, for the second consecutive day, firing about 60 shells from the west coast, which fell in the buffer maritime zone over the limit line.