Apparently, there was a little skirmish between North and South Korea. The two nations are disputing their sea border, and it appears that North Korean forces fired towards South Korean coastal positions along the coast with their own land-based artillery. No casualties have been reported, as it seems both sides simply fired into the air near each other with shells landing harmlessly in the water. A bit of a "pissing contest", to say the least.
Both sides have been provocative in their statements and actions lately. North Korea has tested missiles and atomic devices in recent years. South Korea came out and said that if they are aware of an imminent nuclear strike, they would launch pre-emptive military action, which the North Koreans stated was a provocation of war. However, I would be inclined to believe that the their statements are more of a warning, as South Korea is suited for defensive purposes, not offensive.
Needless to say, things may be getting a little testy in the Korean penninsula.