The half-brother of North Korean leader Kim Jong-un has been killed in Malaysia, the Yonhap News Agency and other South Korean media outlets reported on Tuesday, citing unidentified sources.

Yonhap, citing a South Korean government source, said Kim Jong Nam was killed on Monday morning in Malaysia. It gave no more details.

TV Chosun, a cable television network, said separately that Kim was poisoned at Kuala Lumpur airport by two women believed to be North Korean operatives, who were at large, citing multiple South Korean government sources.

Malaysian police told Reuters an unidentified North Korean man died en route to hospital from a Kuala Lumpur airport. The police said the man’s identity had not been verified.