SEOUL, South Korea -- South Korea’s jailed ex-President Yoon Suk Yeol again refused to attend questioning by investigators Friday, using a new method to resist: He took off his prison uniform and lay down on the floor at his detention room.

South Korea's impeached former president Yoon Suk Yeol lay on the floor of his prison cell wearing only an undershirt and boxer shorts to resist questioning, prosecutors said Friday, after a fresh attempt to bring him in for interrogation over election tampering allegations failed.

Former South Korean President Yoon Suk-yeol is being held in solitary confinement under conditions that have prompted concern from his legal adviser.