A law enforcement official said the letter is very similar to one recently mailed to a US senator. That letter tested positive Tuesday for poisonous ricin. The official requested anonymity because the official was not authorized to discuss the continuing investigation.
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The letters were received at separate facilities that sort mail addressed to the White House and Congrass. The mail facilities are not located on the main White House and Capitol Hill complexes.
"The investigation into these letters remains ongoing, and more letters may still be received. There is no indication of a connection to the attack in Boston," the FBI said in a statement, following Monday's marathon attack.
Word of the suspicious letters comes amid already heightened tensions in Washington and across the US since the deadly bombings in Boston that killed three people and injured more than 170.
Secret Service spokesman Ed Donovan said the letter to Obama was intercepted Tuesday, the same day congressional officials alerted the public to the letter sent to the senator. The Secret Service, which protects the president, is working with the FBI, as well as US Capitol Police, on the investigation, Donovan said.
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