A South Korean naval helicopter chased away three suspected pirate ships attempting to approach a South Korean commercial vessel in Somali waters over the weekend, the military here said Monday. According to South Korean Joint Chiefs of Staff (JCS), the Cheonghae Unit received a call from the 17,000-ton vessel Azalea Sunday morning, that three ships were approaching. The naval unit dispatched a Lynx helicopter from its destroyer, Chungmugong Yi Sun-shin, and the chopper fired off three flares.