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Alicia Acuna wrote on Fox News' website that she and a crew were preparing for an interview with Gianforte when Jacobs walked into the room, produced a voice recorder and asked Gianforte a question. After Gianforte rebuffed Jacobs, and Jacobs asked a follow-up question, Gianforte grabbed him by the neck, Acuna wrote.

"Gianforte grabbed Jacobs by the neck with both hands and slammed him into the ground behind him," she wrote. "Faith, Keith and I watched in disbelief as Gianforte then began punching the man, as he moved on top the reporter and began yelling something to the effect of 'I'm sick and tired of this!'"

In audio of the incident, Gianforte can clearly be heard gettingof a sudden, I heard a giant crash and saw Ben's feet fly in the air as he hit the floor.”

"Ben walked out holding his broken glasses in his hand and said: 'He just body-slammed me,'” Levinson continued.

Whitney Bermes, a reporter for the Bozeman Daily Chronicle, tweeted that the police were called to the scene. The Daily Chronicle also reported that Jacobs was treated by an ambulance on the scene, and Bermes later tweeted that one person was transferred to the hospital.

"Gianforte sitting in a Jeep. Sheriff's deputies were talking to him earlier. Now a medic is at the window talking with him,” Bermes also tweeted .

Gianforte then left the event before he was scheduled to speak, according to reporter tweets.

In an interview, Jacobs told MSNBC he approached