Investigators expanded their search Thursday for the source of ricin discovered on Capitol Hill after intensive testing of a Senate office mailroom failed to turn up the deadly poison’s origin. The ricin was discovered in Senate Majority Leader Bill Frist’s office. Law enforcement officials say no letter or note has been found indicating how it got there, who was behind it and whether the Tennessee Republican was the target. “We’re not at the point in time where we can say how it was delivered,” said Michael Mason, assistant FBI director in charge of the Washington field office. “We have not found a hot letter.” Mail has been the primary focus of the probe since Monday, when an intern found a small amount of ricin on a mail-sorting machine in Frist’s office. But no further ricin or other evidence was in the stacks of letters nearby. Full Story
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