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Charge over Obama ricin letter

A martial arts instructor from Mississippi has been charged with attempting to use a biological weapon after ricin-laced letters were sent to Barack Obama and other officials.

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Poisoned envelope sent to Republican Senator

An envelope sent to Republican Senator Roger Wicker of Mississippi tested positive for ricin, Senator Dick Durbin told reporters after a group of lawmakers were briefed by the FBI.

Ricin is a lethal poison found naturally in castor beans.

A spokeswoman for Mr Wicker referred inquiries to US Capitol Police, according to Reuters.

A spokesman for Capitol Police could not immediately be reached for comment.

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