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Several members of the Congress received mail threatening a biological attack and containing a suspicious powder later found to be harmless as law enforcement officials warned on Wednesday that more letters could be on their way.

A number of media organizations and TV shows, including the New York Times and The Daily Show with Jon Stewart, received mail postmarked Oregon warning that letters had been sent to the Washington or local offices of all 100 U.S. senators and that 10 contained a deadly pathogen, a law enforcement source said…

In a notice to Senate staffers titled “Urgent: Suspicious Mail Alert,” Gainer warned that the sender of the letters had “indicated that additional letters containing a powdery substance will be arriving at more Senate offices and that some of these letters may contain actual harmful material.”

…The letters to the news organizations did not contain any suspicious substances. They demanded an end to corporate money and lobbying in U.S. politics, an end to corporate personhood, and called for a new constitutional convention, the source said. The letters were signed “the MIB.”

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Congress members threatened with biological attack | Reuters

As potentially frightening as this is, that last line made me laugh.