South Korean soldiers fire warning shots after North Korean troops intrude for a 2nd time this month The Associated PressNorth Korea Has Lost ‘Many’ Troops to Mines in DMZ, South Says The New York TimesNorth Korean soldiers cross border, South Korea fires warning shots Al Jazeera EnglishNorth Korea troop ‘casualties’ reported after landmine explosions in DMZ The GuardianSouth Korean military fires warning shots after North Korean soldiers cross demarcation line Reuters.com