South Korea says the sound of artillery fire has been heard near one of its Islands in the Yellow Sea, but it's not clear where it's coming from. The reports come as North Korea warned that U.S. - South Korean naval drills planned for this weekend are pushing the peninsula to the brink or war. In a show of solidarity a U.S. military commander paid a visit to Yeonpyeong island, the site of a previous artillery attack from the North in which four people were killed earlier this week.
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