The FBI said the bureau and the Justice Department's Civil Rights division are "investigating possible civil rights violations in connection with threats to Jewish Community Centers across the country."
But details on that investigation have been scarce, and it's difficult to know the extent of these threats. Are they all connected? Is this all the work of just one person, or more?
Paul Goldenberg, national director of the Secure Community Network, which advises Jewish organizations on security, said the calls are "unprecedented" for their methodical approach and their sophisticated use of voice-masking technology.
JTA News, a Jewish news service, posted audio of one of the bomb threats. In it, a disguised voice warns that a C-4 bomb has been placed in the JCC and that "a large number of Jews are going to be slaughtered."
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