As Pakistan prepares for the second anniversary of the Army Public School massacre, one of the survivors of the horrific December 16 attack succumbed to his wounds on Tuesday.

Irshad Hussain, one of the few remaining survivors of the Peshawar carnage who sustained critical wounds in the attack, was under treatment at a Rawalpindi hospital for two years.

According to Hussain’s family members who are from Chitral, the boy was suffering from mental trauma caused by the attack.

At least 150 people, mostly students and staff members, were killed when Taliban gunmen disguised as troops attacked their military-run school in Peshawar on December 16, 2014.

The deadly attack shocked the entire nation, prompting the government to launch a national action plan (NAP) to root out the scourge of terrorism and extremism once and for all.