US drops the case against poison letter suspect

Authorities in the United States say they are dropping charges against a man accused of sending letters containing poisonous ricin to the US President Barack Obama along with a senator.

Prosecutors say they uncovered new information and freed Paul Curtis from custody. Police are now searching the home of another Mississippi man.

Paul Curtis says he respects President Obama, loves his country and would never do anything to pose a threat to him or any other US official.

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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.