Letter with ricin sent to Miss. senator - CBS News 8 - San Diego, CA News Station - KFMB Channel 8

Letter with ricin sent to Miss. senator

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Jan. 29, 2009 File Photo: Sen. Roger Wicker, R-Miss., speaks during a news conference at the Capitol. Senate Majority Leader Reid said April 16, 2013, that letter with ricin or another poison was sent to Wicker. (AP Photo/J. Scott Applewhite, File) Jan. 29, 2009 File Photo: Sen. Roger Wicker, R-Miss., speaks during a news conference at the Capitol. Senate Majority Leader Reid said April 16, 2013, that letter with ricin or another poison was sent to Wicker. (AP Photo/J. Scott Applewhite, File)

WASHINGTON (AP) — An envelope addressed to Sen. Roger Wicker of Mississippi tested positive Tuesday for ricin, a potentially fatal poison, congressional officials said, heightening concerns about terrorism a day after a bombing killed three and left more than 170 injured at the Boston Marathon.

The letter was discovered at a mail processing plant in Prince George's County in suburban Maryland, said Sen. Dick Durbin, D-Ill.

Wicker's office issued a statement saying "any inquiries regarding member security must be directed to the United States Capitol Police."

Capitol Police had no immediate comment.

But Majority Leader Harry Reid told reporters of the letter, and other lawmakers said they had been provided information by the office of the Senate sergeant-at-arms.

Milt Leitenberg, a University of Maryland bioterrorism expert, said ricin is a poison derived from the same bean that makes castor oil. He said it must be ingested to be fatal.

"Luckily, this was discovered at the processing center off premises," Durbin said. He said all mail to senators is "roasted, toasted, sliced and opened" before it ever gets to them.

One law enforcement official said evidence of ricin appeared on preliminary field tests of the letter, although such results are not deemed conclusive without further testing. The official spoke on condition of anonymity because the investigation remains active.

The discovery evoked memories of the days after the terrorist attacks of Sept. 11, 2001, when mail laced with anthrax began appearing in post offices, newsrooms and congressional offices.

That included letters sent to Sen. Tom Daschle, D-S.D., who was Senate majority leader, and Sen. Patrick Leahy, D-Vt. Two Senate office buildings were closed during that investigation.

Overall, five people died and 17 others became ill. The FBI attributed the attack to a government scientist who committed suicide in 2008.

More immediately, though, the discovery came as lawmakers were demanding answers to the attacks in Boston a day earlier.

There was no evidence of a connection between the bombings and the letter addressed to Wicker, a Mississippi Republican.

___

Associated Press writers Andrew Miga, Seth Borenstein, Eric Tucker and Eileen Sullivan contributed to this report.

Copyright 2013 The Associated Press.

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