So That's What That Was.. But The Tension's Still Escalating..

North Korea intensifies threats ahead of Korea-U.S. military exercise near Yeonpyeong Island slated for Sunday.   Excerpts:

Threatening "a shower of dreadful fire," North Korea warned Friday it will wipe out its enemies if its sovereignty is violated, raising already high tension after the communist country exchanged deadly artillery barrages with South Korea earlier this week.

 The warning by the North's Committee for the Peaceful Reunification of Korea is the latest and one of the strongest threats the North has issued since South Korea and the U.S. agreed to hold joint drills near the communist country in a show of force.

  Two South Korean marines and two civilians were killed in the artillery exchange between the Koreas on Tuesday in one of the most violent clashes on the peninsula since the 1950-53 Korean War.

North Korea, officially called the Democratic People's Republic of Korea (DPRK), denies initiating the clash, warning it will mount additional attacks if its territorial waters are violated.
And:
Meanwhile, South Korea's military is checking reports of sounds of artillery fire around Yeonpyeong Island in the Yellow Sea border with North Korea, officials said. (Hence the "So that's what that was" reference..)

Joint Military Exercises with the U.S. start Sunday, so we've got that to look forward to..