South Korean marines patrol on Yeonpyeong Island December 20, 2010. South Korea plans to carry out a planned firing drill from the island near the border with North Korea from Monday morning, domestic media quoted military officials as saying. The drill is planned for December 20 to 21. North Korea has threatened reprisals if the drill goes ahead. REUTERS/Newsis/Korea Pool

YEONPYEONG, South Korea (Reuters) - South Korean marines have ordered residents of Yeonpyeong island to move to air raid bunkers in anticipation of a live-fire drill on Monday.

North Korea has threatened to strike if the South went ahead with the drill from the island off the Korean peninsula’s west coast and in disputed waters between the rival Koreas.