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Malala Yousafzai has condemned Taliban's attack on a school in Pakistan as a "senseless and cold-blooded act of terror".
The 17-year-old, who now lives in Birmingham, survived being shot in the head by Islamist militants from the group in 2012 for her campaigning for girls' education.
She said the Taliban's attempt to intimidate their enemies around the world were futile, saying "we will never be defeated".
At least 141 children, teachers and soldiers have been confirmed dead in today's attack at the Army Public School in the city of Peshawar.
A man carries a student, who was injured during an attack by Taliban gunmen on the Army Public School A teacher was reportedly burned alive in front of pupils as the Taliban sought bloody revenge on the Pakistani army for operations against them.
Malala said: "I am heartbroken by this senseless and cold-blooded act of terror in Peshawar that is unfolding before us.
“Innocent children in their school have no place in horror such as this."
The 17-year-old has been awarded the Nobel peace prize for her work and continues her campaigns from the UK.
“I condemn these atrocious and cowardly acts and stand united with the government and armed forces of Pakistan whose efforts so far to address this horrific event are commendable." she added.
“I, along with millions of others around the world, mourn these children, my brothers and sisters - but we will never be defeated.”
In pictures: Taliban attack on army school in PakistanShow all 30 1 /30In pictures: Taliban attack on army school in Pakistan In pictures: Taliban attack on army school in Pakistan Pakistan Women mourn the death of a relative who was killed during the attack on the Army Public School, in Peshawar
Reuters
In pictures: Taliban attack on army school in Pakistan Pakistan Sirajul Haq (3-R) head of the Islamic political party Jamat-e-Islami leads the funeral prayers of two school boys who were killed by Taliban militants at a school run by the Army, in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Schoolchildren take part in a prayer for victims of the Taliban attack on the Army Public School in Peshawar, in the northern Indian city of Mathura
In pictures: Taliban attack on army school in Pakistan Pakistan Indian schoolchildren prepare lighted candles ahead of a vigil in the northern city of Jalandhar, as they pay tribute to slain Pakistani schoolchildren and staff after an attack on an army school in the restive city of Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Pakistani journalists in Islamabad attend a vigil for the victims of the attack
EPA
In pictures: Taliban attack on army school in Pakistan Pakistan Chairs are upturned and blood stains the floor at the Army Public School auditorium the day after Taliban gunmen stormed the school in Peshawar, Pakistan
AP
In pictures: Taliban attack on army school in Pakistan Pakistan The uncle and cousin of injured student comfort him as he mourns the death of his mother who was a teacher at the school which was attacked by Taliban
AP
In pictures: Taliban attack on army school in Pakistan Pakistan Pakistani schoolgirls pray for victims, who were killed in an attack at the Army-run school in Peshawar, during a memorial ceremony in their school in Hyderabad, Pakistan,
EPA
In pictures: Taliban attack on army school in Pakistan Pakistan A Pakistani girl, who was injured in a Taliban attack in a school, is rushed to a hospital in Peshawar
AP Photo/Mohammad Sajjad
In pictures: Taliban attack on army school in Pakistan Pakistan A man carries a student, who was injured during an attack by Taliban gunmen on the Army Public School, after he received treatment at a hospital in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Rescue workers and family members carry the coffin of a student, who killed during an attack by Taliban gunmen on the Army Public School, in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Relatives of a student, who was injured during an attack by Taliban gunmen on the Army Public School, comfort each other outside Lady Reading Hospital in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan People carry the casket of a victim of Taliban attack in a school, after receiving it from a local hospital in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A Pakistani woman reacts as she arrives near the site of an attack by Taliban gunmen on a school in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A plainclothes security officer escorts students rescued from nearby school during a Taliban attack in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Pakistani volunteers carry a student injured in the shootout at a school under attack by Taliban gunmen, at a local hospital in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A school boy who was injured in a Taliban attack receives medical treatment at a hospital in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Hospital staff transport a student injured in the shootout at a school under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A Pakistani woman weeps as she waits at a hospital, where victims of a Taliban attack are being treated in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A hospital security guard helps a student injured in the shootout at a school under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A soldier escorts schoolchildren from the Army Public School that is under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Schoolchildren stand outside after being rescued from the Army Public School that in under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A Pakistani army soldier takes position on a bunker close to a school under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A rescue worker waves to make way for an ambulance as it speeded away form a school that was attacked by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A school boy who was injured in a Taliban attack receives medical treatment at a hospital in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A school boy who was injured in a Taliban attack receives medical treatment at a hospital in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A man talks on a phone, with his arm around a student, outside a military run school that is under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Schoolchildren cross a road as they move away from a military run school that is under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan Pakistani army troops cordon off a road leading to a school under attack by Taliban gunmen in Peshawar
In pictures: Taliban attack on army school in Pakistan Pakistan A school boy who was injured in a Taliban attack receives medical treatment at a hospital in Peshawar
Additional reporting by Press Association
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