South Korean special prosecutors team have filed fresh charges including bribery against a close friend of impeached President Park Geun-hye, the central figure in a political scandal that has engulfed the country, the team said Monday.

Choi Soon-sil, in jail since late October and on trial since last month, already faces charges of abuse of power and attempted fraud. On Monday, Lee Kyu-chul, spokesman for the special prosecution team, said it had filed the additional charges.

He declined to provide further details during a regular briefing. Choi's lawyers were not immediately available for comment.