Ousted S Korean President

Ousted S Korean President Park Geun-hye faces prosecutors

After arriving at the office, she told reporters she was "sorry".

Ms Park resisted efforts to question her when she was president, but lost her immunity when judges upheld parliament's decision to impeach her.

She could be charged for allegedly allowing close friend Choi Soon-sil to extort money from large firms.

Ms Choi has been charged with bribery and corruption.