Ousted South Korean President Park Geun Hye left prosecutors' offices early on Wednesday (March 22) after being questioned in an investigation into a corruption scandal that ended her presidency this month.
Park did not respond to reporters' questions as she emerged from the building after nearly 22 hours and entered a waiting car to be driven to her private home.
She smiled and briefly spoke to some of her supporters gathered outside her home before entering the gate without making public comments.
Prosecutors questioned Park as a criminal suspect for the first time since the Constitutional Court on March 10 upheld her December impeachment by parliament.
She is accused of colluding with a friend, Choi Soon Sil, to pressure big businesses to donate to two foundations set up to back the president's policy initiatives.
She and Choi have denied wrongdoing.
Prosecutors declined to comment on Tuesday whether Park would be called back for more questioning or whether they will seek an arrest warrant from the court to detain her.
They did not discuss the details of the questions but said Park was responding well to the investigation.
Tens of thousands of South Koreans stage protest in Seoul calling for President Park Geun Hye to resign
Park, 65, became South Korea's first democratically elected president to be removed from office when the Constitutional Court on March 10 upheld her impeachment.
She issued a brief statement upon arriving at the prosecutors' office on Tuesday, her first public remark since being removed from office.
"I am sorry to the people. I will faithfully co-operate with questioning," she said in front of media at the steps of the prosecutors' office building.
The questioning lasted 14 hours until just before midnight, one of her lawyers, Sohn Bum-gyu, told reporters.
Choi accused of interfering in state affairs using relationship with President
She and her lawyers reviewed her statements made to the investigators, before leaving at 6.55 am local time (5.55 am Singapore time).
Park has not been charged but could face more than 10 years in jail if convicted of receiving bribes from bosses of big conglomerates, including Samsung Group chief Lee Jay Yong in return for favours.
Park's fate and the widening corruption investigation have gripped the country at a time of rising tension with North Korea and China.