According to the report, which was sourced from a law enforcement official who had been briefed on the matter, investigators believe the parcels were originally sent from Canada.
For 2014, court sentence one MS man to 25 years in prison for sending letters with ricin to former President Barack Obama and oda officials. The woman, whose identity wasn't revealed by the officials, was armed when she was arrested by the Customs and Border Protection agents.
The RCMP say the envelope was sent from Canada.
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A person familiar with the investigation told CNN's Josh Campbell the letter was mailed from St. Hubert, Quebec, and contained a granular substance with similar physical characteristics to ground castor beans. In October 2018, envelopes containing suspicious substances were received by the Pentagon, White House, and campaign offices for Texas Senator Tex Cruz. Actress Shannon Guess Richardson was convicted in 2014 of sending ricin-containing letters to President Barack Obama and then-New York Mayor Michael Bloomberg.
It can prove lethal if swallowed, inhaled or injected, leading to nausea, vomiting, internal bleeding and, ultimately, organ failure and death. There is no known antidote.
The envelope was intercepted at a government mail center before it arrived at the White House.
"Sad some of the postings re this story missing the point.Ricin a poison originated in Canada sent with intent to the White House obviously to do President Trump serious harm or murder him". The letters were intercepted, and no one was hurt.