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Police have not alleged that Anthony himself had any involvement in the Longview assault.
The addition of the FBI signals that authorities are treating online threats connected to the case with increased seriousness, particularly as emotions surrounding the Anthony case continue to generate heated exchanges on social media.
Local officials urged residents to avoid escalating tensions online while investigators continue gathering evidence.
Meanwhile, police say they will continue working alongside federal authorities to determine whether any additional crimes related to threats or intimidation occurred before or after the alleged assault.
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