The questioning of Park Geun-hye came 11 days after the Constitutional Court unanimously ruled to dismiss her over suspicions she colluded with a confidante to extort money from businesses and committed other wrongdoings.
Her powers had been suspended since she was impeached by parliament in December.
"I am sorry to the people. I will sincerely undergo an investigation," Park told reporters, without elaborating, when she arrived at the prosecutors' office yesterday.
Park's questioning lasted 14 hours and ended just before midnight. She spent about seven more hours at the prosecutors' office reviewing their report to check whether they accurately described her testimony.
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When she left the prosecutors' office and got into a black sedan waiting for her, Park didn't make any comments to reporters.
But when she arrived at her home in southern Seoul, live TV footage showed Park smiling, talking to ruling party lawmakers and giving a nod in gestures of greetings several times for dozens of flag-waving supporters who lined up streets leading up to her residence.
Prosecutors have previously accused Park of extortion, bribery and abuse of power, which could theoretically carry penalties of up to life imprisonment. But arresting Park would be a delicate matter because it might aggravate a national divide and create a strong conservative backlash ahead of an election in May to choose her successor, some political experts said.
Yesterday, hundreds of Park's supporters waited for hours outside the prosecutors' office, holding anti-impeachment signs and the national flag, which has become a symbol of their protest.
Park had immunity while in office and had refused to meet with prosecutors or allow officials to search her presidential compound.
Park is the first democratically elected leader to be forced out of office in South Korea since democracy replaced dictatorship in the late 1980s.
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