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A Texas man was identified as a person of interest Thursday in the investigation into threatening letters sent to New York City Mayor Michael Bloomberg, which contained the deadly toxin ricin, and to President Obama, which is being tested for the poison, sources told CBS News.

CBS News correspondent Bob Orr reported Thursday that, according to two sources, the letter sent to Bloomberg carried the following threat:

"You will have to kill me and my family before you get my guns. Anyone wants to come to my house will get shot in the face. The right to bear arms is my constitutional, God-given right and I will exercise that right till the day I die. What's in this letter is nothing compared to what I've got planned for you."

All three letters were postmarked May 20 from Shreveport, Orr reports. Shreveport is about an hour-and-a-half-long drive away from New Boston.

The developments come as yet another ricin-laced letter became known Thursday, mailed to Mr. Obama from Spokane, Wash., the FBI said. Authorities arrested a man May 22 in Spokane in connection with that letter, which was intercepted the same day.

The second letter was opened Sunday by Mark Glaze, director of Mayors Against Illegal Guns, the Washington-based nonprofit Bloomberg started. http://www.cbsnews.com/8301-201_162-57587006/ricin-letter-investigatio
n-identifies-texas-man-as-person-of-interest/

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