A package containing ricin was intercepted in the White House mail, a USA official familiar with the matter said Saturday. "At this time, there is no known threat to public safety", the statement read.
The FBI and Secret Service are investigating the matter.
Mail addressed to the White House is prescreened and tested for risky substances at an off-site mail facility.
A preliminary investigation indicated it tested positive for ricin, a poison found naturally in castor beans, the U.S. official said.
Law enforcement officials said a letter was detected at an off-site facility that screens mail addressed to the White House.
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According to New York Times sources, the exact location of the origins of the letter is unknown, but believe to have been sent from Canada. Two different tests were reportedly done to confirm it was ricin. a poisonous substance that can be lethal.
The White House and Secret Service did not immediately return a request for comment. The castor powder he sent was not in its unsafe form. Ricin can cause death within 36 to 72 hours from exposure to an amount as small as a pinhead. There is no known antidote. It can be deployed via powder, pellet, mist or an acid.
In 2014, a MS man was sentenced to 25 years in prison after sending letters dusted with ricin to President Barack Obama and other officials.
Back in 2018, a former member of the Navy was suspected of sending ricin in letters addressed to the Pentagon and Trump.