A federal government alert reportedly sent to law enforcement agencies warns that an intercepted message could serve as an "operational trigger" for "sleeper assets." ...

Federal alert reviewed by ABC News says message may serve as trigger for sleeper cells, though no specific threat identified ...

Add Yahoo as a preferred source to see more of our stories on Google. WICHITA, Kan. (KSNW) – Did you get this emergency alert message Monday evening? This message was sent out Sunday evening and again ...

A 10-second 'Armageddon alert' siren will sound on millions of UK mobile phones at some point this year as part of a test of the government's emergency alert system. The alert, for which a date hasn't ...

JEANNETTE, Pa. (KDKA) — Around the country, many cities, towns, and municipalities have text message alert systems to keep their communities in the know. Soon, Jeannette will be implementing a text ...

WICHITA, Kan. (KSNW) – Did you get this emergency alert message Monday evening? This message was sent out Sunday evening and again Monday evening. According to a spokesperson for the Kansas Department ...