The government's investigation into the December 3 martial law declaration has been extended to November 14.

Assistant counselor Park Ji-young said in a briefing on Friday that the special counsel team investigating the incident had submitted a second 30-day extension to the president and the National Assembly.

A recent amendment to the special counsel law allows the probe to be extended once more, through mid-December.

Park added that evidence clearly supported criminal charges against former Justice Minister Park Sung-jae, whose pretrial detention the special counsel team requested on Thursday, in connection with alleged insurrection.

She added that to ensure fairness, the case is being handled by a team led by deputy special prosecutor Lee Yoon-jae and comprising legal, police and military representatives.

Park Ji-young said former intelligence chief Cho Tae-yong, who was charged with dereliction of duty, had agreed to appear for questioning next week, though Park Ji-young did not disclose the exact schedule of the interrogation.