Kim Yo-jong, the powerful sister of North Korean leader Kim Jong-un, said Monday the situation at the southern border is "very unstable," noting the North is reviewing a possible resumption of loudspeaker broadcasts along the border. The remarks came after Pyongyang has repeatedly denied responsibility for a land mine explosion last month that severely injured two South Korean soldiers and dismissed Seoul's findings that land mines deliberately planted by North Korea were the cause of the blast. "Now the situation of the southern border is very unstable. A grave situation is prevailing along the southern border due to the reckless behavior of the ROK military gangsters," Kim said in an English-language statement carried by the Korean Central News Agency (KCNA). ROK refers to the acronym of the Republic of Korea, South Korea's official name. Kim accused the South Korean military of threatening North Korean soldiers and heightening tension, saying such actions have "gone beyond the red line" following what she called "a fabricated 'mine explosion farce.'" She claimed the South conducted 2,8