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The U.S. Secret Service has intercepted a letter addressed to President Barack Obama that contained a “suspicious substance.”

A law enforcement official said the letter is very similar to one recently mailed to Mississippi Republican Sen. Roger Wicker. That letter tested positive Tuesday for poisonous ricin.

More: Suspicious Substance in Letter Sent to Obama is Intercepted

The official requested anonymity because the official was not authorized to discuss the ongoing investigation.

The letters were received at separate facilities that sort mail addressed to the White House and Capitol Hill. The mail facilities are not located on the main White House and Capitol Hill complexes.

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