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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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Letter sent to US senate office tests positive for poison

A letter sent to the US senate office has tested positive for the poison ricin, reuters has reported.

US senator Durbin said he was briefed by the FBI on an envelope that test positive for ricin.

The senator said he believed the letter was just one of suspicious letters that have been found.

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