Marcella Tovar, 32, was seen cowering on the floor of her classroom as 35-year-old Laelia Flores fell upon her.
The incensed wife rained blows upon the teacher, kicking at her stomach and slapping at her face, as very young students and fellow members of staff stood by and watched.
But, instead of interrupting the attack, many of the bystanders watched, filmed and even encouraged the violence after the angry wife explained to the room that the teacher had been sleeping with her husband.
At one point another woman’s voice off camera can be heard encouraging Flores on by shouting: "Break her".
Driven by the crowd, Laelia can be heard screaming “defend yourself, whore!”, all the while pulling at Marcella’s hair and punching her in the face.
Eventually the scorned wife was seen storming from the room, leaving Marcella on the floor.
A video of the attack was uploaded to YouTube (we have chosen not to include it here, due to its violent nature), sparking outrage amongst viewers.
Meanwhile student Miriam Gracia Adomo said: “The woman charged in and began shouting and screaming before punching our teacher to the floor.
"That’s when I ran to get help.
"But when other teachers came they just stood around watching.
"It was really terrible, terrible.”
A spokesman for the school said: "The woman claimed that our teacher was having an affair with one of the student’s dads and the mother took exception.
"We are appalled that this attack happened in our school and that nothing was done to stop it, and we shall be carrying out a full investigation."