WASHINGTON (AP) -- The FBI says preliminary tests on a letter sent to President Barack Obama indicate the presence of poisonous ricin.
The letter is undergoing further testing because preliminary field tests can be unreliable, creating false positives.
[SPECIAL COVERAGE: BOSTON MARATHON TERROR ATTACK
The letter was intercepted at a facility away from the White House. It comes the day after officials said a letter sent to Sen. Roger Wicker tested positive for poisonous ricin. That letter to Wicker, a Republican, was intercepted at a Senate mail facility just outside Washington.
In light of the supicious letter interceptions Florida Senator Bill Nelson has released the following statement.
"Authorities have confirmed a deadly poison was discovered in at least two separate letters found at White House and Capitol mail facilities. Mail delivery to Senate and other government buildings has been temporarily suspended, and our state offices have special mail handling procedures in place. Also, earlier today, two suspicious items were removed from our Senate office building, nearby the Capitol. Police are questioning a man who had numerous letters in a backpack. Thankfully, the safegaurds authorities put in place since 9-11 are working to protect the people."
The FBI says there is no indication of a connection to the bombing at Monday's Boston Marathon.