A 50-year-old Connecticut man has been indicted by a federal grand jury on charges he made threats against Jews and synagogues on an internet forum for heavy metal music fans.

Prosecutors say Kendall Sullivan posted messages on Metalthrone.net in May, June and this month threatening to "slaughter" Jews and "burn their Synagogue to the ground."

Investigators say they got a search warrant for Sullivan's Stamford home and found more than two dozen firearms, gun parts, high-capacity magazines and hundreds of rounds of ammunition.

Patricia Ferrick, the agent in charge of the FBI's New Haven division, says she believes authorities may have thwarted "a horrific hate crime."

Sullivan is in custody. A message seeking comment was left Thursday with a woman who answered the phone at his home.

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This story has been corrected to show the name of the internet forum is Metalthrone.net, not Metalthrone.com.