Ricin Is Said to Have Been Sent to White House

WASHINGTON — An envelope addressed to the White House contained a substance that federal investigators identified as the lethal substance ricin, according to a law enforcement official briefed on the inquiry.

It is unclear when the envelope was intercepted before it reached the White House mail room, but investigators believe that it was sent from Canada, according to the official.

Federal investigators are working to track down who sent it and determine whether other envelopes have been sent through the postal system.

Ricin, which is part of the waste produced when castor oil is made, has no known antidote.

The White House could not be immediately reached for comment.

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