High-priority alert based on source significance and keyword relevance.
Context
What happened: South Korea's military raised a corps-level fire readiness posture after two Sept. 21 mine explosions in the DMZ injured three South Korean personnel, sources said. The posture stayed in place through Monday's removal of a North Korean minefield south of the MDL.
Key numbers: Two explosions on Sept.
Why it matters: The ministry called Monday's mine removal the first such operation south of the MDL. Loudspeaker broadcasts were considered but not adopted, and the defense minister rejected criticism that Seoul's response was passive.