PESHAWAR - Parents of children killed when Taliban gunmen overran Army Public School gathered Friday to mark the second anniversary of the attack.

More than 150 people - mostly students - perished when heavily-armed men raced through the Army Public School in Peshawar on December 16, 2014, firing indiscriminately.

"We can't forget those children," Army Chief General Qamar Javed Bajwa told the gathering. "The aim of today's function is to recall how much blood was spilled. The wound is very deep and its complete healing is impossible".

General Bajwa said that today, the December 16, is the black day in the history of Pakistan as on this day terrorists even did not spare innocent children.

He said that terrorists martyred 122 children along with their teaching staff. He said that they will not forget this day and terrorists would be punished at all cost to avenge the death of innocent children.

He said being a father, a brother and a husband, he felt the grief of those who were deprived of their children and loved ones. He said that each drop of the APS martyrs’ blood will not go in vain and Pakistan army will fight till elimination of last terrorist. He said that parents and children of the martyrs would be provided all kind of facilities and their children would be admitted to the best institutions of the country for getting education.

Army high ranking officers also held Quran Khwani for the souls of martyred children and teachers.

On this occasion, tight security arrangements were made in the city to thwart any untoward incident. All the educational institutions in Peshawar and Mardan remained closed as part of security measures on the second anniversary of the school carnage.

The educational, social and political organisations held Quran Khwani, walks, seminars and other events throughout the country to express solidarity with terror victims.

The Khyber Pakhtunkhwa government has decided to construct a monument in memory of martyrs of APS Peshawar at the Jinnah Park. Earlier, the provincial government had also announced to construct a monument at the Archives Library.

The APS attack is considered the worst and most painful terrorism incident in the country’s history.

In Khyber Pakhtunkhwa assembly, Speaker Asad Qaiser lit candles in the presence of cabinet members and lawmakers.

The Taliban have said they carried out the attack, in which all nine gunmen died, in retaliation for an army offensive on extremists in the tribal areas.

Authorities have released very few details about their investigation, despite hanging at least four people said to be involved in the attack.