PRESCOTT VALLEY -- A brutal attack on a student at Achieve Academy in Prescott Valley was recorded and posted online.

See video of the attack (GRAPHIC)

azfamily.com

PHOTOS: Enhanced still images from the attack
VIDEO: Principal clams up
VIDEO: Attacker in juvenile detention
VIDEO: Student faces charges
VIDEO: Chair slammed over student

The attack shows a girl taking a chair and slamming it over the head of another student. The attack is being video recorded by someone at a nearby table.

Prescott Valley Police confirm that the attack happened on Thursday, April 11th. Authorities say the attack was prompted after a sunflower seed fight in the cafeteria. The video shows a 14 year old girl grabbing a nearby fold-up chair and slamming it over the head of a 13 year old girl at another table. The 13 year old girl went unconscious after the attack, but has since fully recovered. Authorities also say that at least one other student knew the attack was going to happen and had their cell phone ready to record the incident. The 14 year old girl who hit the girl has been arrested.