North Korea has deployed SA-2 surface-to-air missiles near its disputed Yellow Sea border with South Korea, a report said Sunday as a major US-led naval exercise began further to the south.

The missiles appear to be targeting the South's jet fighters flying near the Northern Limit Line which marks the border, Yonhap news agency quoted a government source as saying.

The defence ministry declined to comment on the report.

South Korea and the United States Sunday launched a naval drill far south of the border, where four people were killed and 18 wounded in Tuesday's surprise artillery bombardment by the North of Yeonpyeong island.

The ageing Soviet-designed SA-2 missile has a range of 5-19 miles (8-30 kilometres).

Other missiles on the North's west coast, such as the Samlet and Silkworm with ranges of up to 95 kilometres, have also been put onto launch pads, the source was quoted as saying.

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