Ousted South Korean President Park Geun-hye apologized to the country on Tuesday as she arrived at prosecutors' offices for questioning as a criminal suspect in a corruption scandal that has gripped the country for months.

Park, 65, became South Korea's first democratically elected president to be removed from office when the Constitutional Court this month upheld her impeachment by parliament in December.

She has been accused of colluding with a friend, Choi Soon-sil, to pressure big businesses to donate to two foundations that backed her policy initiatives. Park and Choi have both denied wrongdoing.