of texas. we did that proactively. interestingly, this school went through their school safety procedure just weeks before this incident. and they went through a lockdown test. they took the precautionary preparation that was expected of them. >> concerning the explosive devices, does it appear that that this student or others made on their own? were there a number of them found? do you have more information on that. >> yes, it appears the explosive devices were made by the shooter. cannot solidly confirm that yet but there is no reason to suspect that any other person other than the shooter made those devices. >> do you know how many there were? >> we are still working on the total number. the reason why is as we gather here right now i don't have information back from his house or the two residences that are being explored to know how many might be in there. and i don't know whether or not the car has been opened up yet to learn how many might be in there. so that's a number we are unable to ascertain at of this moment.