South Korea's opposition party leader has been indicted over allegations that he violated election laws, escalating a row between the ruling and opposition camps.
South Korean prosecutors said on Thursday that they had indicted Lee Jae-myung, the leader of the main opposition Democratic Party, at his home.
In the presidential election in March, Lee was narrowly defeated by Yoon Suk-yeol.
Lee is suspected of making false statements during the election campaign about his involvement in land development projects when he was the mayor of Seongnam.
The Democratic Party strongly criticized the indictment, calling it an unjust political crackdown.
Opposition party officials said they would hold out to the end, adding that justice and the rule of law are not being upheld.
Lee was asked to appear before prosecutors for questioning over the allegations, but did not comply with the summons.
The Democratic Party filed a criminal complaint against Yoon earlier this week. They allege that he gave false explanations about his wife's suspected involvement in stock price manipulation before the presidential race.