Earlier search teams had scoured Waryong Park, where police he was recorded on CCTV footage at 10:53 a.m. on Thursday.
The Mayor of South Korea's capital, and a possible future presidential candidate, was found dead after disappearing Thursday morning local time.
Seoul Mayor Park Won-soon has been reported missing, police said Thursday, after making comments to his family that possibly hinted at suicide. She told police her father had left a verbal message that sounded like a will, and had later turned off his mobile phone.
Park's daughter had called police on Thursday afternoon to report him missing, saying he had given her a "will-like" message before leaving home.
According to some local reports, Park left the official residence at around 10:44 a.m. wearing a black hat and backpack and group texted reporters to cancel a scheduled appointment.
When Park was elected in a landslide victory against the ruling party almost a decade ago - with no political ties or experience - it sparked a public frenzy.
Rescuers arrive to search for missing Seoul Mayor Park Won-soon in Seoul South Korea Thursday
The 64-year-old was a longtime civic activist and human rights lawyer, known for criticizing South Korea's growing social and economic inequalities.
He was briefly jailed and expelled from college in the mid-1970s for protesting the rule of former President Park Chung-hee.
The following year, he founded the People's Solidarity for Participatory Democracy, a progressive coalition later involved in the "Candlelight Revolution" in 2016-2017.
It grew into one of the largest non-profit organisations in South Korea and launched the Beautiful Stores, a chain of charity shops modelled after Britain's Oxfam shops. A member of President Moon Jae-in's liberal Democratic Party, Park has been considered a potential presidential hopeful for the 2022 elections. He became the city's first mayor to be voted into a third term in June past year.
During this term, Park was seeking to transform the capital into a "smart city" in preparation for the Fourth Industrial Revolution as he pledged on the campaign trail.
Earlier this week he courted controversy by being one of several senior Democratic party politicians to attend the funeral of the mother of Ahn Hee-jung, a former provincial governor convicted of sexual offences previous year.
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