Police officers moved quickly to take down a man who allegedly threatened to kill pop star and actress Hilary Duff during her appearance on a Canadian TV show.

Duff was being interviewed Tuesday by MuchMusic host Leah Miller on Live @ Much when a man in the crowd outside the studio started shouting at the 19-year-old star. According to an eyewitness, the unidentified man vowed to kill Duff, prompting several police officers to tackle him.

"The cops slammed his face into the pavement," said someone who saw the incident. "He was bleeding."

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