A teen who was arrested is now facing assault charges after an incident Friday night at the Merrick Carnival.

Nassau police say the 13-year-old female assaulted a 14-year-old female and 15-year-old female around 9:30 p.m.

The 15-year-old girl victim is from Franklin Square. Her mother told News 12 her daughter was at the carnival with two friends and her brother when she was attacked by two other teens that she didn't know.

Nassau police say she was struck several times on her head and after falling to the ground, was kicked repeatedly in the head.

"It started by the two teen girls walking up to my daughter and punching her and throwing her to the ground. She helplessly covered her face while they beat her, unprovoked, and with my daughter even trying to fight back," said the girl's mother, KellyMoran. "The attack itself is horrifying...that last stomp on my daughter's head could've resulted in death."

Moran says her daughter was taken to the hospital and has a concussion.

Nassau police say the 14-year-old victim was dragged to the ground and struck repeatedly in the head.

"We will not tolerate any violence against anybody in our county and when you have mass gatherings like a carnival, sometimes you get people who are going there with bad intent and we will find you, we will arrest you and you will be prosecuted," said Nassau County Executive Bruce Blakeman.

The 13-year-old suspect, whose name was not released, is charged with two counts of assault in the third degree. She's expected to appear in Family Court at a later date.

The carnival will be open Monday until 10p.m. Parents are encouraged to watch their children at the carnival.

A spokesperson for Dreamland Amusements told News 12 children must be accompanied by an adult and there is both private security and Nassau police present at the carnival.