North Korea’s army has fired around 90 more artillery shells into the sea to the north of the disputed sea border with South Korea, according to information from the South Korean General Staff on Sunday. South Korea’s Yonhap news agency reported that the inhabitants of South Korean islands off the west coast had been urged not to leave their homes during the artillery exercises. The South Korean military said that no damage had been caused. According to the South Korean authorities, North Korea fired shells into a military buffer zone in the Yellow Sea, which lies between the Korean Peninsula …