Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. North Korea Threatens New Attacks on South VOA News 25 November 2010 Destroyed houses are seen on Yeonpyeong island, South Korea, 24 Nov 2010 Photo: AP Destroyed houses are seen on Yeonpyeong island, South Korea, 24 Nov 2010 North Korea is warning of more military attacks like its artillery assault on a populated border island if the South continues what the North calls "reckless military provocations." South Korea, meanwhile, says it will "sharply increase" its military forces on Yeonpyeong, where four South Koreans died Tuesday, and four other islands near the disputed maritime border. North Korea's statement, carried on its KCNA news agency, comes as the United States and South Korea prepare a major naval exercise west of the Korean peninsula beginning Sunday. China on Thursday expressed "concern" about the exercise, which will bring the giant aircraft carrier USS George Washington into strategically sensitive waters between China and the Korean peninsula. China's foreign minister also postponed a meeting with his South Korean counterpart citing a scheduling conflict. In its statement, the North said it will "wage second and even third rounds of attacks without any hesitation" in the event of further provocations. North Korea said previously its assault on Yeonpyeong island, which killed two marines and two civilians, was prompted by a South Korean military exercise on the island. South Korean troops were firing away from North Korea but into waters claimed by Pyongyang. Pyongyang has failed to act on similar threats before other recent U.S.-South Korean exercises. But Mr. Lee said Wednesday that the South should "retaliate enormously" to any new military provocation so that the North will not dare to do it again. Tuesday's attack involved more than 100 artillery shells and prompted the South to return fire from a garrison on the island, just 12 kilometers from the North Korean coast. It was the first time South Korean civilians have been killed in a North Korean military assault since Pyongyang shot down a South Korean airliner in 1987. The U.S. State Department said Wednesday the attack was a premeditated violation of the truce that ended the Korean War in 1953. The United Nations Command in South Korea has opened an investigation to determine if that is the case. State Department spokesman P.J. Crowley also said China has a "pivotal" role to play in restraining North Korea. Beijing has long supported North Korea's leadership. Crowley said the United States recognizes that China cannot dictate to North Korea. But he said the Obama administration has told Chinese officials Beijing must make clear to Pyongyang where the responsibility lies for the current situation. China's foreign ministry said it feels pain and regret at the loss of life and property in the incident and urged both sides to stay calm and exercise restraint. The U.S. military says the four-day naval exercise beginning Sunday was planned before the incident but that it will show the strength of the U.S.-South Korea alliance and the U.S. commitment to regional stability through deterrence. U.S. Chairman of the Joint Chiefs of Staff Admiral Mike Mullen said Wednesday he believes the attack is linked to an expected succession of power in North Korea from Supreme Leader Kim Jong Il to his son, Kim Jong Un. In an article published Wednesday in The Washington Post, former U.S. President Jimmy Carter said "it is entirely possible" that North Korea's shelling of Yeonpyeong is designed to remind the world that it deserves respect in talks with neighboring powers that will shape its future. Some information for this report was provided by AP and AFP. .