SEOUL— South Korean prosecutors raided the headquarters of the former party of jailed ex-president Yoon Suk Yeol on Wednesday to gather evidence in an election meddling case against his wife, a day after she was arrested on corruption and other charges.

Former first lady Kim Keon Hee was arrested late Tuesday on a range of charges including stock manipulation and corruption, prosecutors said.

Her arrest came hours after Seoul Central District Court reviewed the prosecutors’ request for an arrest warrant against the 52-year-old.

The court granted the warrant, citing the risk of tampering with evidence, after prosecutors submitted an 848-page opinion laying out Kim’s alleged “unlawful acts”.

Prosecutors said Wednesday they raided the People Power Party office to collect evidence of Kim’s alleged meddling in parliamentary elections.

Yoon quit the party in May after his removal from office but endorsed its candidate in the snap presidential election that was won by the Democratic Party’s Lee Jae Myung.

Opposition leader Song Eon-seog slammed the raid as “nothing short of gangster behaviour”.

“I cannot contain my outrage at the Lee Jae Myung administration’s ruthless political persecution and retaliation against the opposition, spearheaded by the special prosecution,” Song said at a news briefing.

With the arrest, South Korea now has a former president and first lady both behind bars for the first time in the nation’s history.

The charges against Kim include violations of capital market and financial investment laws, as well as political funds laws.

The arrest caps a dramatic fall for the former first couple after Yoon’s stunning martial law declaration on December 3, which saw soldiers deployed to parliament but was swiftly voted down by opposition MPs.

Yoon, a former top prosecutor, was impeached and removed from office in April over the martial law declaration, prompting the country to hold a snap election in June.

He has been in detention since July 10.