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On it that might be used to detonate. we don't know because the analysis is under way is whether or not the devices were meant to go off. whether or not they were to create panic. one of the things we look at when we start to see the introduction of an explosive powder, it's not just somebody mailing a pipe with wires. it appears it's more serious than that. there was white powder found inside the envelope. field tests were under way on that white powder. they know pretty quickly whether or not because some certain tests they can perform whether or not it's something like an anthrax. the fact ...

Operations john richardson. field tests of the pentagon letters indicated the possible presence of ricin. >> these cases usually are easy to solve, because people who put substances like this in the mail aren't very sophisticated. >> reporter: but tonight, the pentagon's spokesman says the letters appear to only contain castor bean seeds, which has to be processed in order to be turned into ricin. still, authorities are being extremely careful and charges could be filed if it is determined that the letters were intended as a threat. david, the suspect has been identified as william clyde allen...

Keep it hidden. >> it's also difficult because think about all the families that are involved here. this has been brutal across the board. >> all right, thanks to all three of you. heidi, barbara mcquaid and michael german. >> we now have two breaking news pieces for you. two packages meant to be sent to the pentagon were intercepted by mail screeners because of suspected poisoning inside. >> the cdc says the poison, ricin, can be deadly and cause respiratory distress, nausea or vomiting. joining us now is nbc news courtney kube. what's the story? >> as you said, the fbi now is in possession o...

But the initial field tests it was not a hazardous substance. this was aleletter that was ope at this base near washington d.c. earlier today. 11 people falling ill. 3 taken to the hospital. we are told it was a lertter to the base commander, ranting, not clear if they had a relationship with the base commander or it was just some perhaps disturbed unhappy individual sending the letter. but the good news is right now it does not appear that a hazardous substance was involved. nonetheless, erin, as it is, you see a rapid resons from law enforcement, military and emergency personnel responding t...

Sent to her apartment in new york city. tom winter joins me here with the latest. what do we know so far? >> what we know from officer law enforcement officials here in new york is that vanessa trump, who's donald junior's wife was taken to the hospital along with two other people as a precaution after they opened a letter and inside the letter which was addressed to donald trump jr. there was a white powdery substance inside. and so out of an abundance of caution they took vanessa trump to the hospital along with two other people. they did field tests on the powder and so far it has come back...