>> previously during that incident the training was happening on the san bruno complex grounds. we had actually a training identify training area which is basically a connex box self-contained, had open doorways. the dispersal during that day on may 21st occurred when they discharged the chemical agent. items and the doors were open as opposed to close as they normally are and that's why the cloud dispersed and went downwind to the school. >> and then how how does it happen that the doors were open? that's part of the investigation that we're looking into. i believe that what we are the investigation isn't complete. so i'm trying to be cautious but i believe that our investigation will find that it was an open air dispersal and that's the reason for that. usually we do open air dispersals with smaller amounts . i believe during that day there was a large amount of chemical agent that was actually used for the training exercise and that's what led to the effects on the school where we're doing the training now. we ceased all chemical agent training right now and we're looking int