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Might call white supremacist violence. but it includes other things as well. >> reporter: tonight, terror expert is warning while white young men seem to fit the profile for mass shooters. people should be on the alert of collecting weapons and violence. >> its the behaviors, because it isnt, if you just look for who you think, you probably have the wrong information and we know that these shooters are, you know, 12 to 88-years-old. they come from all demographics across the country. >> reporter...