South Korea on Saturday raised the front half of a warship that exploded and sank a month ago near a contested sea border with North Korea, finding clues that support growing suspicions Pyongyang attacked the vessel. The 1,200-tonne corvette Cheonan sank in what military officials said was likely a torpedo attack.<br/> <br/>Forty-six South Korean sailors were killed in what could be one of the deadliest strikes by Pyongyang on its rival since the end of the 1950-53 Korean War. The North has denied involvement.<br/> <br/>South Korea's President on Friday gave the clearest signal yet Seoul had no plan to launch a revenge attack, calming investors worried that armed conflict would damage the South's rapidly recovering economy.<br/> <br/>