The Amber Alert program is an urgent bulletin system established in the United States and since adopted in Canada that is activated in some cases of child abduction.
It uses electronic highway signs and designated local broadcasters to announce the name and a description of the abducted child, plus descriptions of any vehicle suspected of being involved in the crime.
The first Amber Alert system was established in 1996 in Texas after a nine-year-old girl, Amber Hagerman, went missing. She was riding her bicycle near home when she was kidnapped and murdered. The killing remains unsolved.


http://www.cbc.ca/canada/story/2009/...ber-alert.html


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