Photographs taken inside the Pakistan school where at least 132 children and nine staff died in a Taliban attack show bullet-ridden walls and bloodied books on the floor.
Funeral prayers are today being said for the victims who died in the attack in Peshawar.
Funeral prayers were held today for some of the children murdered by Taliban militants in an attack on a Pakistani school yesterday.
Vigils are also taking place around the country and in neighbouring India after the attack in Peshawar, which left 132 schoolchildren and nine members of staff dead.
Three days of mourning were announced by Pakistan's Prime Minister following the violent siege.
The father of a 15-year-old boy killed in the Taliban attack on a school in Peshawar has blamed Pakistan's security forces for failing to protect children and staff.
Advocate Ajun Khan told ITV News: "They totally ignored each and every thing about our security, about our children [...] they have completely failed."
Khan, who works in the local courts, said the military-run school usually had security at its gates as well as personnel with weapons on the roof.
He described his son, Asfand, who was in the final year of his studies, as "very intelligent" and said he was "very badly injured" when he saw him before his death.
The Prime Minister of Pakistan has lifted a ban on the death penalty following the Taliban attack on a school that killed 141 people.
Three days of mourning have begun in Pakistan in the wake of a Taliban massacre at a school in Peshawar which left 132 students and nine members of staff dead.
Prime Minister Nawaz Sharif announced the official mourning period as people around the country lit candles and staged overnight vigils in honour of the slaughtered schoolchildren.
The grounds of the Army Public School - the scene of the attack - were all but empty this morning, aside from snipers manning the roofs and an armed guard at the entrance.
The Pakistani Prime Minister has vowed revenge on the Taliban for a horrific attack on a school, leaving more than 130 children dead.
A total of 132 schoolchildren and nine staff members were killed in the siege at the Army Public School in Peshawar.
Speaking after the attack, Prime Minister Nawaz Sharif vowed to "take revenge for each and every drop of our children's blood that was spilt."
A survivor of the Taliban attack on a school in Peshawar says he put his tie in his mouth to stop from screaming as he hid from gunmen.Read the full story ›
Most of those killed were children, nine teachers were among the dead.Read the full story ›
Malala Yousafzai, who was herself shot by the Taliban when she was just 14, said she stands by those who were killed or injured in today's school attack in Peshawar.
My family and I are heartbroken after hearing the news that more than 100 innocent children and teachers have lost their lives in this recent attack in a school in Peshwar.
We stand with all those families and all those children who are injured right now and who are suffering this big trauma and now it is time that we unite.
I call upon the international community, leaders in Pakistan, all political parties and everyone that we should stand up together and fight against terrorism and we should make sure that every child gets safe and quality education.
Prime Minister David Cameron has said the attacks in Australia and Pakistan showed the worldwide threat posed by the "poisonous ideology of extremist Islamic terrorism".
Addressing a committee of MPs, Mr Cameron said: "It is nothing to do with one of the world's great religion's Islam, which is a religion of peace, this is a perversion.
"But we have to recognise the scale of what we face in this country, but also as we see around the world, and we must, with our allies, use everything we have in our power to defeat it.
"That means combating terrorism. It means defeating ISIL in Iraq and Syria but above all it means asserting the freedoms that we hold to - the values of freedom, of tolerance and democracy."
The Prime Minister added: "This is going to be the struggle of our generation both here in our own country and around the world and we're going to have to show every bit of resilience".