THE EMERGENCY ALERT SYSTEM HAS BEEN ACTIVATED - IS YOUR STATE ONE OF THEM?

The audio message is an EBS:
“This is not a test, the emergency alarm system has been activated, the telephone lines must be kept closed. Boston, Chicago, Los Angeles, New York, Pennsylvania, San Francisco, San Diego, Seattle and Washington DC "

A list of cities, all with ports or military naval bases, the first two:
- Boston Navy Yard: It was one of the oldest shipbuilding structures of the United States Navy.
- Chicago: Naval Station Great Lakes is the home of the United States Navy's only training camp, located near North Chicago Naval Station Great Lakes - https://en.qaz.wiki/wiki/Naval_Station_Great_Lakes
- Pennsylvania = Philadelphia, there is a shipyard on Delaware ...