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The tools, and bystanders with the tools to recognize sort of red flags and warning signs and be better at barricading the doors, essentially, against a violent threat. what we haven't done very well, and in fact, i would say we're failing miserably at, is the longer term, what we call secondary prevention or primary prevention, rather, the prevention of radicalization to begin with, so we're seeing just an increasing number of people take violence into their own hands and that's why americans are seeing this again and again, these kinds of incidents. and we can't really arrest and ban our way...

Shootings and schools end with the suspect being killed. >> trace: there is a concern that police put forth on saying this suspect may in some capacity hurt himself or harm himself. you bring up a great point about social media and the social media footprint kids have now there has been a push in school districts to do more of a full vetting of the social media footprint of some of the kids who might be troubled or who get in trouble at school and have been in fights and stuff. are nufavor of that? do you think that is a good weapon or tool for police to use when you are talking about schools ...

>> break news this hour -- a mass shooting here in the nation's capital. an urgent manhunt. we're here at the washington navy yard. it is just behind me. right in the heart of the nation's capital. police say at least 12 people were killed. and the gunman also is dead. another potential suspect may, may, be on the loose right now. although there is, by no means 100% confirmation that there was a second shooter. the dead shooter has been identified as aaron alexis, a 34-year-old military contractor, from texas. he was able to penetrate this well-secured u.s. military installation not far from...