N Korea killed Jong-un's brother using banned chemical: US
North Korea used a banned chemical weapon to assassinate Kim Jong-nam, the half-brother of its leader Kim Jong-un last year, the US State Department said. "This public display of contempt for universal norms against chemical weapons use demonstrates the reckless nature of North Korea," the US said. Reportedly, Jong-nam was viewed as a threat in a dictatorship with hereditary succession.