CNN › Eric Levenson and Barbara Starr, CNN ›

How emergency alerts are supposed to happen, and what went wrong


The false alarm of a missile heading for Hawaii left Americans wondering how the missile detection and emergency messaging systems are supposed to work -- and what went wrong.
The false alarm of a missile heading for Hawaii left Americans wondering how the missile detection and emergency messaging systems are supposed to work -- and what went wrong.
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Jan 14, 2018 - 03:23 [Local time]