REPUBLIKA.CO.ID, SEOUL- North Korea's military warned Tuesday that its artillery and rocket forces are at their highest-level combat posture in the latest in a string of bellicose threats aimed at South Korea and the United States.

The announcement came as South Koreans marked the third anniversary of the sinking of a warship in which 46 South Korean sailors died. Seoul says the ship was hit by a North Korean torpedo, while the North denies involvement.

Seoul's Defense Ministry said Tuesday it hasn't seen any suspicious North Korean military activity and that officials are analyzing the North's warning. Analysts say a direct North Korean attack is extremely unlikely, especially during joint US-South Korean military drills that end April 30, though there's some worry about a provocation after the training wraps up.

The rival Koreas have had several bloody naval skirmishes in disputed Yellow Sea waters since 1999. In November 2010, a North Korean artillery strike on a South Korean island killed two marines and two civilians.

North Korea, angry over routine US-South Korean drills and recent UN sanctions punishing it for its Feb. 12 nuclear test, has vowed to launch a nuclear strike against the United States and repeated its nearly two-decade-old threat to reduce Seoul to a "sea of fire." Despite the rhetoric, outside weapons analysts have seen no proof that North Korea has mastered the technology needed to build a warhead small enough to mount on a missile.

On Tuesday, the North Korean army's Supreme Command said it will take "practical military action" to protect national sovereignty and its leadership in response to what it called US and South Korean plots to attack. The statement, carried by the North's official Korean Central News Agency, cited the participation of nuclear-capable B-52 bombers in South Korea-US drills.

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