NEW YORK (CBSNewYork) — The New York Islanders say that authorities are investigating a series of hostile tweets directed at defenseman Nick Leddy.

The Nassau County Police Department and FBI were notified on Tuesday after a Twitter user “made violent threats” and posted a photo of Leddy’s driver’s license, Newsday reported. Other tweets included a photo of his MasterCard and “images of an unidentified woman posing with Leddy, with derogatory words written over her face and body,” according to Yahoo Sports.

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“We alerted local and federal authorities immediately, as well as the NHL,” an Islanders spokesperson told Newsday. “They’re investigating the matter. Nick and his family are safe.”

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The account — which has been suspended — was targeting Leddy for months prior to Tuesday’s escalation and it’s unclear whether the user was identified, the newspaper reported.

Leddy was acquired from Chicago in October. He signed a long-term extension to stay with the Islanders last month.

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The 24-year-old Minnesotan played over 26 minutes in Tuesday night’s loss to his hometown Wild.