PRO/EDR> Ricin – USA: (Washington, DC) letters

Poisoning — Worldwide/Unknown
A letter addressed to President Barack Obama contained a substance that preliminarily tested positive for the deadly poison ricin, authorities said on Wed 17 Apr 2013.
News that the letter to Obama was being investigated came as a flurry of other reports of suspicious letters and a package caused the evacuation of parts of 2 Senate buildings and set nerves in Washington on edge.
The letter contained “a granular substance that preliminarily tested positive for ricin,” an FBI statement