again has hit ft. hood. it's really incredible to see this nightmare reoccur once again. >> in the earlier ft. hood massacre, there, this happened at a medical unit. and once again, tonight, we find out that it was at the first medical brigade, which is a medical unit. is there any significance to that? >> none that i can see at this point in time, although, i agree with you. it's very coincidental at the same facility. >> is there anything going on with the shooter though? as far as you know, was there something in this person's history? is there a reason? was he undergoing treatment? is it too preliminary to answer that. >> i wish i had more breaking news to answer that. it is way to preliminary. this is a very fluid situation where the investigation has just started. we do know the identity of the