 North Korea conducted a new round of artillery firing drills near the disputed Sea Boundary with South Korea on Saturday. Officials in Seoul said, South Korea's Joint Chiefs of Staff said the North fired more than 60 rounds near the Western Sea Boundary.A day earlier, North Korea fired about 200 artillery shells near the area, prompting South Korea to conduct its own firing drills in response. The Joint Chiefs of Staff said it strongly urges North Korea to halt acts that heightened tensions.