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.

Impeached South Korean President Yoon Suk Yeol was indicted for insurrection on Sunday, an unprecedented development in weeks of political and legal crisis since his short-lived martial law attempt stunned the nation.

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.