FILE PHOTO: The White House is seen on the first day of a partial federal government shutdown in Washington, U.S., December 22, 2018. REUTERS/Yuri Gripas
WASHINGTON/OTTAWA (Reuters) - An envelope addressed to the White House and intercepted by U.S. authorities contained a substance identified as ricin, a deadly poison that appeared to have been sent from Canada, the Royal Canadian Mounted Police (RCMP) said on Saturday.
An RCMP spokesman confirmed "it has received a request for assistance from the FBI in connection with a suspicious letter sent to the White House."
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