(LEAD) N. Korea warns of 'powerful counteraction' if S. Korea intrudes 'even a millimeter' into its territory

What happened: North Korea's foreign ministry warned of an "immediate and powerful counteraction" if South Korea intrudes even "a millimeter" into its territory, after Seoul blamed Pyongyang for a Sept. 21 land mine blast at the DMZ that critically injured two South Korean soldiers. Key numbers: Blast on Sept. Why it matters: The North denied involvement and ruled out talks on its military sovereignty, while Seoul's military conducted a mine-clearing operation with the U.N. Command and a task force was launched to discuss the MDL line.

North Korea's foreign ministry warned of an "immediate and powerful counteraction" if South Korea intrudes even "a millimeter" into its territory, after Seoul blamed Pyongyang for a Sept. 21 land mine blast at the DMZ that critically injured two South Korean soldiers.

The North denied involvement and ruled out talks on its military sovereignty, while Seoul's military conducted a mine-clearing operation with the U.N. Command and a task force was launched to discuss the MDL line.