SEOUL, South Korea - North Korea warned South Korea not to hold live artillery drills on a front-line island the North shelled last month, saying it would hit back harder than in the previous attack that killed four South Koreans.

The North also warned the South against holding drills before it responded by launching artillery shells Nov. 23 that destroyed homes and renewed fears of war.

South Korea has said it plans one-day, live-fire drills sometime between today and Tuesday on Yeonpyeong, a tiny island home to fishing communities and military bases that sits seven miles from North Korean shores. Seoul said the timing will depend on weather and other factors and that drills will be held despite the threats.

The North does not recognize the U.N.-drawn sea border in the area and says it considers such drills an infringement of its territory.

A senior North Korean military official said in comments carried by the North's official Korean Central News Agency that if South Korea goes ahead with more drills on Yeonpyeong, "unpredictable self-defensive strikes will be made."