In 2017, a false alarm spurred widespread panic in Hawaii. Residents received a Saturday morning alert to their mobile phones sent that turned out to have been sent in error. It stated in capital letters: “Ballistic missile threat inbound to Hawaii. Seek immediate shelter. This is not a drill.”
https://www.msn.com/en-us/money/markets/evacuation-order-telling-residents-to-leave-los-angeles-is-broadcast-on-tv-in-error/ar-AA11kYz3?pc=DCTE&cvid=90fa69d5da0f4aec90bb8dd2d75144b1
comms i bet…reminder to be cozy…