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A letter addressed to President Barack Obama tested positive for the poison ‘ricin’ and was from the same sender who mailed a letter to a senator that also tested positive, officials told NBC News on Wednesday.

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The letter to Obama was intercepted at an off-site White House mail facility and was being tested further, the FBI said. A federal law enforcement official said that the letter was “very similar” to one addressed to Sen. Roger Wicker, R-Miss.

Federal officials told NBC News that they believe they know who sent the letters, but no arrest was made because authorities were waiting for further test results.

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Ricin is made from castor beans and can kill within 36 hours. There is no antidote. Some threatening letters simply contain ground castor beans, resulting in a positive field test for ricin without the concentrated poison. Results from full laboratory tests are expected in the next 24 to 48 hours. SOURCE