With fellow students screaming and swearing in the background, in a viral video that's been seen thousands of times on social media, a girl who attends South Middle School in Brockton was dragged around by her hair, was punched and was kicked, according to her mother.

BROCKTON - With fellow students screaming and swearing in the background, in a viral video that's been seen thousands of times on social media, a 13-year-old girl who attends South Middle School in Brockton was dragged around by her hair, was punched in the head and was kicked, according to her mother.

Brockton Public Schools said it's investigating the incident, which took place on Monday outside of South Middle School after classes were dismissed, while stressing the need for parents to monitor their children's social media interactions to ensure that their online activities are appropriate and responsible.

The mother of the 13-year-old, Kris Kenney, told The Enterprise that her daughter is the victim of bullying. Kenney said her daughter was walking toward her father's car to get picked up when the violent incident took place. Kenney said her daughter's face was red, swollen and teary-eyed from the assault. Afterward, said Kenney, the 13-year-old was transported to Signature Healthcare Brockton Hospital for evaluation. The 13-year-old is named Hannah Kenney-Blaisdell, her mother said.

"They grabbed her by her hair, dragged, punched and kicked her repeatedly in her face and head," Kenney said. "This was my final straw. I am fighting for justice for my daughter now."

Kenney held out a large chunk of her daughter's brown hair that her family saved from the scene as evidence, holding it up to reporters outside her Brockton apartment on Wednesday. The 13-year-old said she was dragged at least three feet, ripping out her hair in the process.

Kenney said she can't watch the video of her daughter's beating with breaking down.

"I can't watch it without crying," she said.

Kenney said the incident began with lewd comments exchanged between her daughter and another girl. Earlier during the school day, in the lead-up to the incident, Kenney said her daughter was speaking out loud, quoting a crude phrase from an animated television series called "Big Mouth," which is aimed at adults. Another girl at the school made an offensive comment toward the 13-year-old, according to the mother's account. Kenney said her eighth-grade daughter, Kenney-Blaisdell, then made a crude comment back at the other girl, leading to the violent confrontation with the other girl's friend after school ended on Monday afternoon.

After the opposing girl's friend pulled the 13-year-old by her backpack, Kenney said her daughter threw a punch, but missed. After that, her daughter got dragged around the ground by the hair, and was then repeatedly struck in the head, which was captured on a 30-second Snapchat video by another student. Kenney downloaded the video and posted it on Facebook.

The Facebook video has been viewed more than 23,000 times, and was shared on the social media site more than 450 times.

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Kenney claimed that there was a lack of supervision outside of the school when students were let out.

"To have no supervision outside that school, while there are still kids on school grounds, is unacceptable," she said.

Brockton Public Schools Superintendent Kathleen Smith responded to the incident in a statement to The Enterprise. Smith said the school district takes acts of violence "very seriously," and has a zero tolerance policy for students trying to settle disagreements with violence.

Smith said the South Middle School administration and Brockton School Police are investigating.

Without getting into the specifics of the violent confrontation, Smith used the incident to remind parents to monitor their children's social media use.

"Incidents that begin on social media and come into the school setting can be very disruptive to the educational setting and our students’ well-being," Smith said. "It compels us to stress the importance of the need for parents and guardians to monitor a child’s social media interactions to ensure that their use is appropriate and responsible."

When it comes to bullying, Smith said Brockton Public Schools, along with the city government, the Brockton Police Department, and the Brockton Fire Department are holding the "Community Safety and Security Forum" on March 27, from 6 to 8 p.m., at the Brockton High School auditorium.

"Among the presentations planned is one offered by Brockton school resource officers on the challenges of Social Media use," said Smith, "and we urge all families to be represented."

Kenney said she was "absolutely not" satisfied by the school district's response. Meanwhile, Kenney said her daughter wants to go back to class, even though the Brockton mom is scared about it. Brockton students are expected to return to school on Thursday, after two snow days.

"Bullying hurts emotionally, and now physically, and stays with a child for a very long time," Kenney said. "I am at the point that I fear for my daughter's life if I were to send her back to that school."