AUSTIN (KXAN) – The officer captured in a viral video hitting an arrestee pinned to the ground was attacked from behind before the recording started, according to an arrest warrant affidavit.

The video shows an Austin Police officer on top of 19-year-old Johnny Acuna-Jacobo, appearing to punch him several times.

The arrest warrant affidavit stated that an APD officer was trying to break up a fight between two men on 6th Street on Friday night, when the officer was “unexpectedly attacked from behind.” Acuna-Jacobo hit the officer on the back of the head multiple times before he was detained, per police documents.

“The blows caused immediate, sharp pain and disorientation, making it clear that Johnny's assault needed to be stopped before further injury occurred. Fearing additional harm an

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