Mobile phones had also been taken over as SMS alerts also displayed the same warning and emergency sirens were sounded.
A missile had been launched from North Korea that flew over Japan and landed 500 nautical miles of the coast in the Pacific.
Despite world wide condemnation of Kim Jong-un, the dictator is still continuing to test nuclear weapons, with a sixth test over the weekend setting off a 6.3 magnitude tremor.
The weapon, a hydrogen bomb with inter continental ballistic missile capabilities, has North Korea’s neighbours, the South and Japan, the US and Europe all on alert.