North Korea has arrested a fourth official over the failed launch of a new warship that has enraged the country's leader, Kim Jong Un. Ri Hyong-son, deputy director of the ruling Workers' Party's Munitions Industry Department,

North Korea has begun steps to arrest and investigate those responsible for a failed launch of its second naval destroyer this week

North Korea righted a capsized 5,000-ton warship and moored it at a pier in the Chongjin Shipyard state-run media reported, two weeks after a failed launch that leader Kim Jong Un condemned as a "criminal act.