North Korea says it successfully tested hydrogen bomb

The Latest on the tensions on the Korean Peninsula (all times local):4:10 p.m.South Korea's presidential office says the security chiefs for Seoul and Washington have spoken following North Korea's sixth nuclear test.The office says U.S. National Security Adviser H.R. McMaster spoke with his South Korean counterpart, Chung Eui-yong, for 20 minutes in an emergency phone call about an hour after the detonation.North Korea's nuclear test Sunday was apparently its most powerful yet. State-controlled