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Discussion of the components and what that could tell investigators about who did this in boston. another developing story we're following right now, an envelope turned into a possible biological weapon against a u.s. senator. early tests show a letter sent to republican roger wicker of mississippi contains the deadly poison ricin. it was intercepted before it got to his office on capitol hill. cnn's shannon travis is in washington for us this morning following this story. what can you tell us about the investigation at this point, shannon? >> christine, we can tell you that the letter was pos...

Preliminary test. the envelope addressed to, again, the white house, was quarantined and is part of now a coordinated investigation headed up by the fbi. this statement notes that operations here at the white house were in no way impacted. it never reached any area that touches the president in any way. the statement also adds that filters at a second government mail screening facility -- filters, also tested positive for ricin this morning on a preliminary basis. now, i've been previously told that preliminary tests as we know sometimes test positive and then you find out a negative test late...

Members of the senate, members of the news media and others as well. that investigation never completely 100% satisfactory by any means. dana, standby. joe johns is our crime and justice correspondent. you're getting more information, joe, on what's going on. what are you picking up? >> dribs and drabs quite frankly, wolf. first we're being told authorities letting people out of their offices in the hart building there on capitol hill on the senate side, but they have not been given the all clear sign yet. so we don't know what all of that means at this time. we're also hearing from the fbi th...

Enough to kill a human being. robert wicker is a republican from minnesota. shannon travis is with us this morning. we know where the letter might have been mailed from. has we're trying to figure out is who mailed that letter, right? >> absolutely. in both those questions, federal officials will be investigating. we know essentially where it was from. it was post marked at least memphis, tennessee. but there's no return address. that's the information that we are getting from the senate sergeant at arms, terence gainer, an e-mail to senators and aides. expert also perform more tests today to ...

Heather: welcome back. fox news alert now, brand-new details as police investigate a letter mailed to a u.s. senator that tested positive for a dangerous poison. word this morning of a possible person of interest. mike emanuel is live for us on capitol hill. so, mike, what is the latest. >> reporter: good morning. a senior capitol hill source says there are other suspicious letters, possibly sent by the same person, to other government officials, and that source says at least one letter was addressed to the white house. as for the letters sent to senator roger wicker from mississippi it has te...