(WASHINGTON) — A letter addressed to President Obama containing a suspicious substance was intercepted on Tuesday, the Secret Service tells ABC News.
The letter was received at a remote mail screening facility not located near the White House complex.
Officials tell ABC News the letter tested positive in a field test for ricin. However, they emphasized that these tests are preliminary and unreliable. A final and complete analysis will be done at an accredited lab.
The Secret Service is investigating the matter, working closely with the U.S. Capitol Police and the FBI.
On Tuesday, the office of Sen. Roger Wicker of Mississippi also received a suspicious letter potentially laced with ricin, postmarked from Memphis. Testing on that letter is incomplete but expected to be finished Wednesday afternoon.
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