(LEAD) Military: artillery sound from within North's territory, no shells land in southern waters SEOUL, Nov. 26 (Yonhap) -- The series of explosion sounds heard Friday on the border island attacked by North Korea earlier this week appear related to training within the North's territory, military officials said. No shells landed in waters on either side of the Koreas' Yellow Sea border or near Yeonpyeong Island, said Col. Lee Bung-woo, a spokesman at the South's Joint Chiefs of Staff. "The firing was not aimed at us, and we believe the sounds were heard as North Korea conducted its routine training...