Supporters and opponents of ousted President Park Geun-hye are set to stage rival mass rallies in central Seoul on Saturday as prosecutors mull over whether to seek to arrest the country's former leader on multiple corruption allegations.

Anti-Park protesters have taken to the streets each Saturday since late last year until the Constitutional Court upheld the parliament's decision to remove Park from office earlier this month.

These photos show two different masses of people filling downtown Seoul on March 4, 2017, in protests for and against impeaching President Park Geun-hye. The Constitutional Court upheld the National Assembly's vote to impeach Park on March 10. She is accused of colluding with her personal friend in a series of corrupt activities. (Yonhap)

They will hold another candlelight vigil in Gwanghwamun Square in central Seoul from 6 p.m. to demand the detention of the scandal-hit former president and her former aide Woo Byung-woo.

Prosecutors are mulling over whether to seek an arrest warrant after they carried out a marathon interrogation of Park from Tuesday to Wednesday. She is known to have denied all allegations raised against her.

Woo, a former senior secretary for civil affairs, is suspected of aiding and abetting Choi Soon-sil, Park's friend of 40 years, in meddling in state affairs and disrupting a special presidential inspector's investigation into the influence-peddling scandal.

He is one of the last figures embroiled in the massive scandal to avoid arrest so far.

Prosecutors on Thursday visited the presidential office Cheong Wa Dae for a search and seizure of his office, but were denied entry due to security reasons.

The protesters are planning to march toward the office of Acting President and Prime Minister Hwang Kyo-ahn from 7:30 p.m.

Park's supporters, meanwhile, will hold their rally just meters away near the city hall from 2 p.m., demanding the disbandment of the Constitutional Court and the National Assembly.

Police said they will mobilize some 12,300 officials nearby the two demonstrations for contingencies.

The rallies held by pro-Park protesters have been turning violent recently, with some attacking police officers and reporters on duty. (Yonhap)

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