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The mayor of new york. early tests show that the letters sent to mayor michael bloomberg contained a small amount of the poison ricin. final results are expected today. now, tests for ricin are also being carried out on the letter that was sent to president obama. an official says that letter looks similar to the one sent to bloomberg. now, all the letters were postmarked from shreveport, louisiana. the letters to bloomberg threaten to kill anyone who tries to take away their guns. ricin, one of the deadliest toxins known to man less than a pinpoint can kill a person in 36 to 48 hours. but usi...

Envelopes was an orange-ish pink color and also oily. the source tells us that for example, if you crush these castor beans which is where you get ricin, you will get certain trace amounts. when they say trace amount, it is substantially different in terms of its toxicity and its danger than, for example, a weaponized ricin. >> all right. the investigation goes on. d deb, thanks. ricin is one of the most deadly toxins known to man. using it as a weapon is not easy, as it may sound. since the 9/11 attacks there have been six attempted ricin attacks in the u.s. no one was injured or killed. most...

The letters threatened the mayor of bloomberg, but the mayor was never really in any danger, as a matter of fact, piers, each tested negative, but the second showed trace amounts of ricin. the letters were then sent and now are being sent by the forensic analysis center, and so we should have conclusive results within the next day or two, piers. >> and various members, three of the nypd were treated for exposure to the ricin. but they have been released. is that right? >> yes, they responded with the emergency services unit. they responded, the letters were opened. and later they came down wit...

Orange, oily substance. the letters threatened the mayor of bloomberg, but the mayor was never really in any danger, as a matter of fact, piers, each tested negative, but the second showed trace amounts of ricin. the letters were then sent and now are being sent by the forensic analysis center, and so we should have conclusive results within the next day or two, piers. >> and various members, three of the nypd were treated for exposure to the ricin. but they have been released. is that right? >> yes, they responded with the emergency services unit. they responded, the letters were opened. and ...

Material. what police are describing as a pink, orange, oily substance. the letters threaten mayor bloomberg, but the mayor was never in any immediate danger. as a matter of fact, piers, initially each of the letters tested negative, but a second test showed trace amounts of ricin. the letters were then sent and are now being tested right now by the national bio forensic analysis center, and so we should have conclusive results, probably within the next day or two, piers. >> various members, three, i believe, of the nypd emergency services, were treated for exposure to the ricin. but they have...