AP source: Envelope addressed to White House contained ricin

U.S. officials have intercepted an envelope addressed to the White House that contained the poison ricin

WASHINGTON -- Federal officials intercepted an envelope addressed to the White House that contained the poison ricin, a U.S. law enforcement official told The Associated Press on Saturday.

The letter appeared to have originated in Canada, according to a statement from the Royal Canadian Mounted Police, which said it was assisting the FBI

The U.S. official was not authorized to discuss the ongoing investigation publicly and spoke on condition of anonymity.

Federal investigators were working to determine where the enveloped originated and who mailed it. The FBI, the Secret Service and the U.S. Postal Inspection Service were leading the investigation.

In a statement, the FBI said agents were working to investigate “a suspicious letter received at a U.S. government mail facility” and that there is “no known threat to public safety.”

A Navy veteran was arrested in 2018 and confessed to sending envelopes to Trump and members of his administration that contained the substance from which ricin is derived.

Authorities said the man, William Clyde Allen III, sent the envelopes with ground castor beans to the president, FBI Director Christopher Wray, along with then-Defense Secretary Jim Mattis, then-CIA Director Gina Haspel, Adm. John Richardson, who at the time was the Navy’s top officer, and then-Air Force Secretary Heather Wilson. The letters were intercepted, and no one was hurt.

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Associated Press writer Rob Gillies in Toronto contributed to this report.