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let's bring in cnn justice reporter evan peres. evan, i know you're working your sources as well. what's the latest? what are you hearing? >> well, the focus of investigators at this hour is what's the motive here, what was this gunman looking to do. we know he entered the terminal and started shooting. it seemed to be focused at shooting tsa employees. we're told that in his bag, in the bag that he was carrying where he took the gun from, took the rifle from, that authorities recovered a letter of some kind with a rant against the government and specifically against the tsa. we don't know exactly what the cause of this was. we don't know whether there was some beef he had with the tsa previously personally, but we know that authorities believe that he went in there and he was looking to kill tsa employees. and again, at this hour, we're still trying to figure out, the authorities are still trying to figure out where that came from, what is the cause of that. >> i assume they know his name, they know his address. >> correct. >> i assume they're going through social media, trying t