North Korea Nuclear Detonations, Missile Tests: Timeline

North Korea conducted its third underground nuclear test today, three weeks after the United Nations increased sanctions against Kim Jong Un’s regime following its December long-range rocket and satellite launch.

North Korea detonated “an atomic warhead that is lighter and miniaturized but with a big explosive charge,” the official Korean Central News Agency said today. South Korea said the nuclear explosion took place at 11:57 a.m. local time with an estimated yield of 6 to 7 kilotons, bigger than North Korea’s previous tests in 2006 and 2009.