According to a NST Online report, the victim, a Form 2 student at the school, sustained serious head and bodily injuries.
He is being warded at the Sultanah Bahiyah Hospital’s intensive care unit in Alor Star.
Kuala Muda Police Chief Md Zukir Md Isa said police believed the incident arose after the victim had apparently pulled the arm of a classmate.
The classmate’s brother is said to have later attacked the victim with three others.
Zukir said four boys had been detained for questioning and are being investigated under Section 325 of the Penal Code for voluntarily causing grievous hurt.
The victim’s father has lodged a report with the police.
According to an Astro Awani report, the father claimed his son was asked by his teacher to call the attacker’s sibling into the classroom but this act was misunderstood by the attacker.
He said the boy complained of headaches after school on the day of the attack and started vomiting on the way to hospital. Scans taken later revealed there was bleeding in the brain.