FILE - In this March 12, 2013 file photo, New York City Mayor Michael Bloomberg speaks during a news conference at in New York. New York City Police said on Wednesday, May 29, 2013 that

 

              FILE - In this March 12, 2013 file photo, New York City Mayor Michael Bloomberg speaks during a news conference at in New York. New York City Police said on Wednesday, May 29, 2013 that
FILE - In this March 12, 2013 file photo, New York City Mayor Michael Bloomberg speaks during a news conference at in New York. New York City Police said on Wednesday, May 29, 2013 that two anonymous letters sent to Bloomberg 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/Seth Wenig, File)