A school deputy principal was killed and three other people, including a student, were injured in an attack carried out by teenagers in the La Union settlement of Mexico, APA reports.
The Quadratin news agency reported this, citing the attorney general of Coahuila state.
According to preliminary information, two teenagers believed to be brothers entered the school building at around 08:30 local time and carried out the attack.
The assailants reportedly used bladed weapons and bottles believed to contain an incendiary substance.