Former South Korean President Park Geun-hye was set free under a presidential pardon on Friday after four years and nine months in jail after her impeachment and ouster from office for graft charges. This is according to Yonhap news agency.

The 69-year-old Park has served a combined 22-year prison sentence since March 2017 after being impeached and removed from office over far-reaching corruption and an influence-peddling scandal involving a close friend accused of manipulating her.

Last week, President Moon Jae-in decided to pardon Park as part of his special amnesty for the new year. The government said the decision was made in consideration of her deteriorating health and as part of efforts to promote national unity.

Park has been receiving treatment at a Seoul hospital for a series of back, shoulder and other ailments. She received a certificate of pardon at the hospital at midnight and is expected to remain there until early February.

Park will be provided government security protection but is not subject to other former presidential privileges, such as the provision of special pensions for retired presidents and personal secretaries, due to her conviction.

Where she will stay after leaving the hospital remains unclear for now, as Park's private home in southern Seoul was auctioned off as part of her forfeiture.

Her supporters have held rallies near the hospital in southern Seoul to celebrate her freedom. A number of standing flower wreaths with messages wishing her good health have lined a street near the hospital.

The amnesty for Park, the eldest daughter of former authoritarian President Park Chung-hee, is expected to have a significant impact on the upcoming presidential election in March, as she has commanded strong support of voters in Daegu and North Gyeongsang Province, a stronghold of the main opposition People Power Party (PPP).

Earlier in the day, Yoon Suk-yeol, the presidential candidate of the PPP, told reporters during a visit to Park's political stronghold of Daegu, 300 kilometers southeast of Seoul, that he hopes to pay Park a visit after she recovers her health.

Park's release has put Yoon, a former career prosecutor, in an awkward political position as he headed the investigation of Park's corruption scandal in 2016 that eventually led to her impeachment, ouster from office and imprisonment. Ultra conservative supporters of Park have called for Yoon to give up his candidacy.

Yoon also said the government should grant a pardon to former President Lee Myung-bak, currently serving a 17-year prison term over embezzlement and bribery charges.

(With input from agencies)