wayne allen root, brace yourself. >>> so i hope to get through tonight. i want to begin with breaking news, threatening letters sent to the mayor of new york. police say he mentioned his stand on gun control. joining me is cnn's deborah feyerick, national security analysts and leonard cole, an expert in bioterrorism and author of "the anthrax letters" two letters, one to mayor bloomberg, both threatening in tone. both of them laced with a quantity, not quite sure how much of ricin. both alluding to the gun control campaign, the mayor has been spearheading. >> correct. what we do know, the two letters, one of which was sent to d.c., the other to new york, both appear to have been written by the same person. shared the same postmark. also, they contain the same 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 t