South Korean opposition parties introduced a bill Thursday calling for an independent investigation into impeached President Yoon Suk Yeol's brief martial law declaration, as thousands of his supporters and critics held tense rallies near his residence ahead of his potential detention. The bill, jointly submitted by six parties, including the main liberal opposition Democratic Party, proposes that a special prosecutor investigate whether Yoon's martial law decree on December 3 constituted an attempted rebellion. The bill also calls for an investigation into opposition claims that Yoon sought to provoke a clash with North Korea by allegedly flying drones over Pyongyang or discussing the possibility of shooting down trash-laden balloons launched from North Korea across the border, to justify a power grab at home. Yoon's lawyers and the South Korean military have denied the suspicions. Yoon remained holed up at his official residence in the capital city of Seoul, where the presidential