I saw this on my local news yesterday, but you can read about it in this article on Newsday: apparently there was an accidental activation of the emergency broadcast system yesterday that called for an evacuation of the state of Connecticut. Apparently a worker "entered the wrong code" into the system.
It worries me less that it happened and more that there is actually a code in the system that calls for the evacuation of an entire state. I would think that a evacuation of the state code might bring up some sort of "Are you sure?" warning. Guess not.