North Korea believed behind murder of leader's half-brother - U.S. source

People watch a TV screen broadcasting a news report on the assassination of Kim Jong Nam, the older half brother of the North Korean leader Kim Jong Un, at a railway station in Seoul, South Korea, February 14, 2017. Lim Se-young/News1 via REUTERS

KUALA LUMPUR/SEOUL (Reuters) - The U.S. government strongly believes that North Korean agents murdered the estranged half-brother of North Korean leader Kim Jong Un in Malaysia, U.S. government sources said on Tuesday.

American authorities have not yet determined exactly how Kim Jong Nam was killed, according to two sources, who did not provide specific evidence to support the U.S. government's view.