especially teenagers before the event and they may sometimes release it. it can be viewed as attention seeking behavior but the fbi research into this, they have a name for it called leakage. leakage, which is a way the shooter before the attack is somehow or other trying to get a message out, either a threat or a cry for help or something. in this particular case the shooter did not display these on social media. the investigators found them on his phone. >> i guess one of the questions is, how do we prevent these types of things from happening? parents, do they need to play a stronger role in the lives of their kids? if they live with kids do they need to lock up their guns? what are some of your more general suggestions? >> yes and yes to your