(UNITED NATIONS) -- The U.N. Security Council is meeting Sunday in an emergency session to discuss the tense situation on the Korean Peninsula.
South Korea plans an artillery exercise this week from the same island that North Korea shelled last month.
The North has warned of a "catastrophe" if the exercise is held.
New Mexico Gov. Bill Richardson, who has met with top leaders in North Korea, has called for "self-restraint" by both countries.
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