Isn't this the type of thing the new Alert Ready emergency alert system is for? Or is that only if a child has been abducted?
http://toronto.citynews.ca/2018/04/10/police-search-for-missing-girl-6-in-scarborough/
http://toronto.citynews.ca/2018/04/10/police-search-for-missing-girl-6-in-scarborough/