AMBER alerts are used by law enforcement to notify the public about missing children thought to have been abducted. AMBER Alerts are only used for the most serious child abduction cases, when authorities believe a child is in imminent danger of serious bodily injury or death. The goal of AMBER Alerts is to add millions of extra eyes and ears to watch, listen and help in the safe return of the child and apprehension of the abductor.

https://www.fcc.gov/consumers/guides/amber-plan-americas-missing-broadcast-emergency-response