The broadcast alert came just days after noisy neighbour Kim Jong-un threatened to fire four Hwasong nuclear missiles in the direction of the American island territory.
The alarm read: “A broadcast station or cable system has issued a civil danger warning for the following countries/areas: Guam; at 12:25 a.m. on Aug. 15, 2017, effective until 12:40 a.m. Message from KTWGKSTO.”
However the worrying test was not connected to any emergency, heightened threat or warning, BNO news reported.