Postpublished at 16:27 Greenwich Mean Time 16 December 2014
In Islamabad, activists and journalists lit candles in memory of the Peshawar victims, demanding an end to violent attacks.
Officials say more than 140 people, mostly children, have been killed in a Taliban attack on an army-run school in north-west Pakistan
Pakistan's security forces say their operation has now ended, with all seven attackers killed
Some pupils, who escaped, earlier said the gunmen went from classroom to classroom, shooting children indiscriminately
The Taliban say the assault is in response to army operations in North Waziristan and the Khyber area. All times GMT
Yaroslav Lukov, Alastair Lawson, Kerry Alexandra, Julia Macfarlane, Sally Taft and Jasmine Coleman
In Islamabad, activists and journalists lit candles in memory of the Peshawar victims, demanding an end to violent attacks.
The number of people killed in the Peshawar assault has now surpassed the previous worst terrorist attack in Pakistan's history - the tragedy on the Meena bazaar in 2009, the Guardian reports, external.
British Prime Minister David Cameron says the school attack is a "a dark, dark day for humanity".
The militants made no demands; they started killing children as soon as they entered the school, the Pakistani army is quoted as saying by Reuters.
Pakistan's army spokesman Asim Bajwa says 132 children and nine staff members were killed in the attack.
Shaimaa Khalil
BBC News, Peshawar
What we are yet to know is whether all the children have been evacuated or if some are still in the school. That is really what many of the parents here [at the school] are worried about - they want to know if these other children are OK.
tweets:, external AUDIO: Eyewitness at #Peshawar hospital says 1000s trying to donate blood http://bbc.in/16pyCmF, external pic.twitter.com/EwqnXpsCyg
UN High Commissioner for Human Rights Zeid Ra'ad al-Hussein - the first Muslim and the first Arab to hold the office - accuses the Taliban of "sinking to an all-time depth" in carrying out the attack. He says the group's ideology "bears no resemblance to any religion or any cultural norm".
tweets:, external The security personnel are now carrying out clearance operation: our correspondent Muhammad Shoaib reports #PeshawarAttack
The Pakistani Taliban has grown more extreme and violent as its circumstances have grown more dire, the Guardian's Jason Burke, external reports. He says that the movement has recently been divided by bitter internal competition and that when militants organisations do this, they "often become more extreme as individual commanders and their followers seek to prove themselves the most effective, and the most audacious".
Although the army says the attack on the school is now over, soldiers are continuing to patrol the streets of Peshawar.
UN Secretary General Ban Ki-moon describes the attack as "an act of horror and rank cowardice to attack defenceless children while they learn". He adds that "no cause can justify such brutality and no grievance can excuse such horror".
Afghan President Ashraf Ghani condemns the attack as a "wild act". He says killing innocent children is an absolutely un-Islamic and inhuman act. The BBC's Mike Wooldridge says that both Afghanistan and Pakistan face continual attacks by their respective Taliban movements, and both have frequently accused each other of supporting militant extremism.
Pakistani journalist Ahmed Rashid tells the BBC the Taliban raid was "a revenge attack, as many children in the school are sons and daughters of army officers". Mr Rashid adds it was also "an attempt to unify the Taliban, who are currently divided"
Earlier in the day, Pakistani troops sealed off the area, taking up positions around the school in Peshawar.
Mohammed Tayyab (@tayyabm76) in Islamabad tweets, external: "This has shaken us.. badly shaken. Whoever i am talking to, is in tears... We, as a nation must change our direction."
"The carnage struck at the heart of Pakistan's military - one of the nation's most highly respected institutions - which is seen as the guardians of stability in a turbulent region and an important bridge between Pakistan and Western allies such as the United States," the Washington Post reports., external
Shocked relatives have been waiting outside Peshawar's Lady Reading Hospital - desperate to hear about the fate of their loved ones.
"This is the world's loss," Mr Kerry says. "This act of terror angers and shakes all people of conscience, and we condemn it in the strongest terms possible."
Following on from President Obama, US Secretary of State John Kerry describes the attack as "absolutely gut wrenching... A house of learning turned into a house of unspeakable horror".