A special parliamentary committee investigating President Yoon Suk Yeol's martial law bid failed Wednesday to hold on-site hearings against Yoon and other key officials as they refused its requests to attend.

The commander of a crack South Korean special forces unit told a court Thursday he had been asked by a superior officer how to cut electricity to parliament during last year's failed martial law order by impeached president Yook Suk Yeol.

A former military commander who has accused President Yoon Suk Yeol of ordering the removal of lawmakers from the National Assembly building during December's brief imposition of martial law is set to testify at Yoon's impeachment trial Thursday.