LONDON -- South Korean prosecutors formally indicted President Yoon Suk Yeol on Sunday, charging him with insurrection over his brief imposition of martial law in December, according to opposition lawmakers and South Korean media.

Investigators say Yoon Suk Yeol abused his power when he tried to impose martial law last month. He would become the first sitting South Korean president to be arrested.

After lawyers of South Korean President Yoon Suk Yeol argued that his arrest on January 15 was unlawful, a photo spread in social media posts falsely claiming it showed a search warrant used to illegally detain him rather than an arrest warrant.