claire mccaskell came out and told reports, that the initial suspicion was it was a man back in mississippi for lack of a better way to say it, harassing. and it's clear really within 24 hours they went and found him. >> and dan a, i know there were some other scares today, but this man from tupelo, mississippi, hometown of senator wicker's, this is the only person who is responsible for all of the letters, right? >> reporter: they believe so. they believe so. and i'm sorry, erin, literally as you were asking me that question, i looked down at my phone here and got another text from my source who said this was an fbi grab based on united states capital police information. so that's just a little bit more -- a nugget of how this went down. of course, hopefully we'll get more as this unfolds. but they believe that this was the one man who sent the letters. but you're right. there was a lot of drama here on capitol hill, because there was so much anxiety. there is supposed to be no mail