South Korean President Park Geun-Hye speaks during a meeting with Kazakhstan's President Nursultan Nazarbayev at the presidential house in Seoul on November 10, 2016.

South Korean prosecutors said on Sunday that they believed President Park Geun-hye was an accomplice in a corruption scandal that has rocked her administration, in a heavy blow to her fight for political survival.

The prosecutors' comments, which came as they indicted a close friend of Park's and two of her former aides, are likely to spur stronger calls for her to step down or be impeached.