SEOUL, South Korea, Dec 8, (AP): South Korean prosecutors on Sunday detained a former defense minister who allegedly recommended last week’s brief but stunning martial law imposition to President Yoon Suk Yeol, making him the first figure detained over the case. The development came a day after Yoon avoided an opposition-led bid to impeach him in parliament, with most ruling party lawmakers boycotting a floor vote to prevent the two-thirds majority needed to suspend his presidential powers.

The main opposition Democratic Party said it will prepare a new impeachment motion against Yoon. On Sunday, ex-Defense Minister Kim Yong Hyun was taken into custody at a Seoul detention facility after undergoing an investigation by prosecutors, a law enforcement official said, requesting anonymity in line with privacy rules. The official gave no further details.

But South Korean media reported that Kim voluntarily appeared at a Seoul prosecutors’ office, where he had his mobile phone confiscated and was detained. The reports said police searched Kim's former office and residence on Sunday. Repeated calls to Seoul prosecutors' offices and police agency were unanswered.

Senior prosecutor Park Se-hyun said in a televised statement Sunday that authorities launched a 62-member special investigation team on the marital law case. Park, who will head the team, said the probe would "leave no suspicions.” Yoon accepted Kim’s resignation offer on Thursday after opposition parties submitted a separate impeachment motion against him. Kim is a central figure in Yoon’s martial law enforcement, which led to special forces troops encircling the National Assembly building and army helicopters hovering over it.

The military withdrew after the parliament unanimously voted to overturn Yoon’s decree, forcing his Cabinet to lift it before daybreak Wednesday. In Kim’s impeachment motion document, the Democratic Party and other opposition parties accused him of proposing martial law to Yoon. Vice Defense Minister Kim Seon Ho told parliament that Kim Yong Hyun ordered the deployment of troops to the National Assembly.