A suspicious substance has been found in a letter addressed to U.S. President Barack Obama at a facility where mail is inspected before being forwarded to the White House, the U.S. Secret Service said Wednesday.
The letter was intercepted on Tuesday at a remote mail screening facility, the Secret Service said in an email. It said its facility "routinely identifies letters or parcels that require secondary screening or scientific testing before delivery."
The Secret Service said it was working closely with the U.S. Capitol Police and the FBI in the investigation. The letter was similar to one that was sent to a Republican senator and reported late Tuesday, CNN and Politico reported.
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