May 29th, 2013
08:17 PM ET

Threatening letters sent to Bloomberg test positive for ricin

CNN has learned that a letter addressed to the New York City Mayor Michael Bloomberg contained material that tested positive in preliminary tests for the deadly poison - ricin.

Threatening letters to Bloomberg test positive for ricin

A second letter also tested positive for the substance that was sent to an office in Washington DC that houses "Mayors against Illegal Guns," an organization Bloomberg helps run.

OutFront tonight: CNN's National Security Analyst Fran Townsend and Dr. Ian Lipkin – an epidemiologist and the medical mind behind the movie "Contagion."

Filed under: Crime • News • Ricin
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