The FBI Joint Terrorism Task Force and the NYPD Intelligence Division were investigating the incident.
The discovery of the letters comes just weeks after ricin-tainted letters were mailed to President Barack Obama and other government officials. James Everett Dutschke, 41, a martial arts instructor, was arrested in Tupelo, Mississippi, on April 27 on suspicion of mailing those letters.
Browne said previous letters sent to the mayor have tested positive for anthrax, though in most cases letters "with threats implying it was anthrax or ricin" contained only baking soda.
Ricin is a lethal poison found naturally in castor beans, but it takes a deliberate act to convert it into a biological weapon. Ricin can cause death within 36 to 72 hours from exposure to an amount as small as a pinhead. No known antidote exists.
(Reporting by Edith Honan and Chris Francescani; Editing by Scott Malone, Paul Thomasch and Eric Beech)
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