POLK COUNTY, Fla. -- Six teen girls lured a former friend to a home and ambushed her, taking turns pounding on her face and body for 30 minutes until she was unconscious as someone videotaped the violence, according to the Polk County Sheriff's Office.

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PHOTOS: Attack Lasted 30 Minutes

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"Shocking, I've never seen anything like it," Polk County Sheriff Grady Judd said. "They seem to have absolutely no remorse at all. I don't understand the sheer violence."

Investigators said the victim apparently posted something against the six girls on MySpace before she was lured to the home by a phone call from teen Mercedes Nichols.

Police said the girl traveled to the house and walked into the trap.

One girl met her at the door and five others were hiding in a back room, detectives said. The girls were then seen on video pummeling the girl in the face and body and slamming her head into a wall.

As the videotape rolled, a girl's voice is heard yelling "There is only 17 seconds left; make it good."

Police said the girls wanted to post the video on YouTube and MySpace.

"'There is only 17 seconds left; make it good,'" Judd said. "That is animalistic behavior and it is pack mentality. They lured her there to beat her and beat her. They left her with a concussion. We have photographs of her with two black eyes; her nose is swollen."

The girl was taken to a hospital by ambulance and treated for a concussion, damage to her left eye and left ear, and numerous bruises, the report said.

The girl can no longer see well out of one eye and hear from one ear, Local 6 reported.

Police said two boys stood lookout outside the house during the beating.

Some of the girls accused of being involved in the attack were on a cheerleading squad at a local high school in Lakeland.

Judd said he wants the teens tried as adults, Local 6 reported.

The six girls and two boys face battery and false imprisonment charges.

Watch Local 6 News for more on this story.