message is. as we're looking at these, you're saying he is showing the full or she arsenal here. does this appear in any way random to you? is this part of the message, i can do it this way, this way and if so what does that tell you about the background of this person? could there be a military background, a law enforcement background? >> quite possibly. what law enforcement's biggest concern is the frequency and repetitive of these attacks. the longest investigation in fbi history, the unabomber case. ted kaczynski began in 1978 and continued until 199 r5 and arrested in 2006. 23 injured, 3 people killed. only 16 devices. we now have five gudevices in t span of two weeks and we have three different methods of delivery. that's concerning. >> but is there anything in there that has signs of the