Ricin is a highly toxic substance extracted from castor beans that have been used in terror attacks. It can be used in the form of powder, mist, pellet or acid. If one ingests the poison, it causes vomiting and internal bleeding of the stomach and intestines, failure of the liver, spleen and kidneys and subsequent death by collapse of the circulatory system.
The Federal Bureau of Investigation (FBI) and Secret Service are probing the matter.
"The FBI and our US Secret Service and US Postal Inspection Service partners are investigating a suspicious letter received at a US government mail facility. At this time, there is no known threat to public safety," the FBI's Washington field office said in a statement to CNN.
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
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