[amckinlay]

This kind of accident has happened many times in the history of the Emergency Alert System (EAS)[1] and the earlier Emergency Broadcast System (EBS). The false alarm of 1971[2] actually revealed a major flaw in the EBS. During the incident, a legitimate national alert initiation message was erroneously broadcast instead of the scheduled test message. Many stations did not propagate the message as required because of confusion caused by receiving it within the time window of a scheduled test. Interestingly, this revealed a major flaw in the system in the event of a real emergency: that an adversary could time its attack with a test broadcast of the EBS, rendering the system generally ineffective.

[1] https://en.wikipedia.org/wiki/Emergency_Alert_System#Inciden...

[2] https://en.wikipedia.org/wiki/Emergency_Broadcast_System#Fal...