FILE- In this April 25, 2013 file photo, New York City Mayor Michael Bloomberg, right is joined by New York City Police Commissioner Raymond Kelly, left, during a news conference in New York. New York City Police said on Wednesday, May 29, 2013 that two anonymous letters sent to Bloomberg, one in New York and one in Washington, contained traces of the deadly poison ricin. Police say civilian personnel who came into contact with the letters were not showing any symptoms, but some officers who later examined the one in New York were. (AP Photo/Mark Lennihan, File)

Associated Press
FILE- In this April 25, 2013 file photo, New York City Mayor Michael Bloomberg, right is joined by New York City Police Commissioner Raymond Kelly, left, during a news conference in New York. New York City Police said on Wednesday, May 29, 2013 that two anonymous letters sent to Bloomberg, one in New York and one in Washington, contained traces of the deadly poison ricin. Police say civilian personnel who came into contact with the letters were not showing any symptoms, but some officers who later examined the one in New York were. (AP Photo/Mark Lennihan, File)
FILE- In this April 25, 2013 file photo, New York City Mayor Michael Bloomberg, right is joined by New York City Police Commissioner Raymond Kelly, left, during a news conference in New York. New York City Police said on Wednesday, May 29, 2013 that two anonymous letters sent to Bloomberg, one in New York and one in Washington, contained traces of the deadly poison ricin. Police say civilian personnel who came into contact with the letters were not showing any symptoms, but some officers who later examined the one in New York were. (AP Photo/Mark Lennihan, File)
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