A transgender teen who was attacked by a group of people at a pool last week had uploaded a video of herself pummeling a black girl just days before.

A group of up to 20 people attacked the 18-year-old transgender woman, Dakota Kern, at a pool party in Phoenix on August 16 — and the brutal beating was shared on social media by the perpetrators.

On August 12, just four days earlier, Kern had shared a video of herself pulling a black teen by the hair and pummeling her in the head. The Facebook video shows Kern calling the black girl a “b*tch” as she drags her across pavement. Kern also says in the video not to call her a “dude.”

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The victim of that attack wrote on YouTube that Kern had been “harassing me for a long time.”

“[J]ust let y’all know I’m only 17 years old and this transgender is 19 years beating me up calling me bitch and he littray slam me on the floor calling me bitch while he was hitting me in The face [sic],” she wrote.

The two incidents appear to be related. One Facebook user commented “That’s why you got what you got the other night” on the video August 20.

“Well u beat up my grandaughter last week Karma ain’t no joke,” another Facebook user wrote on Kern’s page.

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Kern told local media outlet CBS 5 that she was invited to the party, but people started shouting slurs at her shortly after she arrived. Kern decided to leave, but then heard a man yell “get it, get it!”

“Then one of the guys, he ends up grabbing me by my head, grabbing me by my hair and then he hit me a few times,” Kern explained.

In a video shared on social media, a group of people can be seen kicking Kern, who appears to be unconscious.

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Kern is recovering after being taken to a local hospital.

Phoenix police told 12 News that a 15-year-old boy has been arrested for the pool attack and at least two other people face charges. They are treating the attack as a hate crime.

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3TV | CBS 5