2017 Guam false civil danger warning
At midnight on August 15, 2017, two radio stations in Guam, KTWG and KSTO, a music channel, and a Christian network, accidentally broadcast a civil danger warning. This false alarm caused panic during heightened tensions with North Korea, who at the time, had previously threatened to fire missiles into waters near Guam.
Source: Wikipedia — 2017 Guam false civil danger warning (CC BY-SA 4.0)