WASHINGTON — A letter addressed to President Obama containing a substance that initially tested positive for the toxin ricin was intercepted Tuesday by authorities at a remote White House mail screening facility, according to the FBI.
The letter follows the discovery Tuesday of a ricin-laced letter sent to Sen. Roger Wicker (R-Miss.) and came as authorities were investigating suspicious packages in and near the offices of members of Congress.
Edwin Donovan, deputy assistant director of the U.S. Secret Service, did not identify the substance. However, he said the Secret Service is working closely with the U.S. Capitol Police and the FBI.
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