Missing Person Alert guidance

I would like to know what is needed to create a missing persons alert with picture and other identifying information and to go across Canada and potentially the United States as well. I am trying to figure out how I would store all that data as there are literally thousands upon thousands of missing persons in Canada and the United States. I know these Countries have their own already in use by law enforcement but the people have spoken and want their own they where they control when the alert is issued and the content. The number 1 concern is timeā€¦

Use an online database of your choice, for example MySQL

Where do you get the data from? Is there an API available?