Report: Second poison letter sent to US Senate

Terry Moran, of ABC News, has tweeted that a second letter sent to the US Senate has tested positive for the poison ricin.

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BREAKING: @abc has learned a SECOND letter sent to the US Senate has tested positive for the poison ricin.

Yesterday, an envelope sent to Republican Senator Roger Wicker of Mississippi tested positive for ricin.

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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.