>> investigators are trying to determine what got paul astencia into the letters he was carrying. is going to treat every american as a potential terrorist, then it creates a self-fulfilling prophecy. the note also said he had no intention of killing, quote, innocents, and that he made a conscious decision of trying to kill several tsa employees. he said he wanted to instill fear in what he called their traitorous minds. they haven't been able to question him because he's in critical condition in the hospital, but he could get the death penalty if he's convicted. he shot several rounds at hernandez, but when he moved away and hernandez started to move, he returned and shot him again, and as we know, hernandez was fatally wounded, david. >> how much additional security will there be for tsa at airports? >> they said the shooting will not lead to a decision to arm tsa officers, and they have a couple reasons. first they say airport security has never been tsa's mission. that's in the hands of airport police or other city officials who do carry firearms. the job of tsa is to protect