By Jeff Labrecque
Updated February 23, 2012 at 03:12 PM EST

Jon Stewart and Stephen Colbert have received letters threatening biological attacks on U.S. senators, a law enforcement official told Reuters. The threats reportedly specified that all 100 senators would receive letters, 10 of which would be laced with a deadly biological substance. According to a Senate official, several politicians have received suspect letters but none of them has yet tested positive for anything lethal. Comedy Central could not be reached for comment.

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