Brazilian girl, 15, who had her clothes ripped off at school during beating has been victim of violent attacks before, says mom

Harrowing video footage captured the moment a 15-year-old student was pummeled by her classmates at a school in Brazil.

The girl, whose name has been withheld, appeared in one of the videos talking to a female student at the Maria Mathilde Castein Castilho State School in Glicério, São Paulo, on Tuesday.

The student could be seen grabbing her by the hair and forcing her to walk down the hallway before a second student joined her in the assault and ripped off the victim's shirt.

The girl who initiated the beating was seen in a second video dragging the defenseless student into a packed school yard and beating her before school staff broke up the fight.

Her mother, Marcia Rocha, witnessed the part of the beating, which lasted nearly two minutes, after she arrived to pick up her up at dismissal.

'My daughter was naked in front of everyone. And seeing that scene hurt, but I couldn't do anything,' she told TV Tem. 'I felt helpless, I couldn't save my daughter.'

Rocha said she forced her way inside the school and found her daughter crying.

The teen was taken to a local urgent care facility and treated for bruises.

Rocha's husband filed a police report and even considered seeking revenge against the bullies, according to Brazilian newspaper Metrópoles. 

Rocha said that her daughter recently receiving treatment after doctors suspected she had autism.

'Last week, I didn't take it seriously, because I thought it was a teenager thing,' the concerned mother said. 'Today, when I got there, I saw the fight and, until now, I don't understand.

'I send my daughter to school with a broken heart, with scared, because she has autism and suffers persecution at school, bullying. I no longer know who to turn to,' she added.

The Birigui Education Board opened an investigation. All three students were moved to remote learning for the remainder of the week.