WARNING: GRAPHIC PICTURES
The Afghan Taliban has condemned the mass murder of more than 100 children by its Pakistani counterpart as un-Islamic.
Mass funerals have been held for some of the 142 people, most of them children, killed by the Pakistani branch of the extremist group in a school attack that has plunged Pakistan into mourning and anger.
The Afghan branch of the Taliban, which calls itself the Islamic Emirate of Afghanistan, said it was "shocked at the incident and shares the pain of the families of children killed in the attack".
"The intentional killing of innocent people, women and children goes against the principles of Islam and every Islamic government and movement must adhere to this fundamental essence," its spokesman said.
Prayer vigils were held across the nation and in other schools, students spoke of their shock at the carnage in the city of Peshawar, where seven gunmen from the Pakistani gunmen, explosives strapped to their bodies, scaled a back wall using a ladder to get into the Army Public School and College in the morning hours on Tuesday.
Students were gunned down and some of the female teachers were burned alive with pupils made to watch.
Some of the funerals were held overnight, but most of the 132 children and 10 school staff members killed in the attack were to be buried Wednesday. Another 121 students and three staff members were wounded.
"They finished in minutes what I had lived my whole life for, my son," said Akhtar Hussain, tears streaming down his face as he buried his 14-year-old, Fahad. He said he had worked for years in Dubai to earn a livelihood for his children.
"That innocent one is now gone in the grave, and I can't wait to join him, I can't live anymore," he wailed, banging his fists against his head.
The government declared a three-day mourning period, starting on Wednesday.
Pakistan Mourns Taliban School Attack Dead
(01 of12)
Open Image ModalPakistani mourners gather around the coffin of a victim of an attack by militants on an army-run school during a funeral ceremony in Peshawar on December 17, 2014. Militants rampaged through an army-run school in the northwestern city of Peshawar and killed at least 141 people, almost all of them children, in the bloodiest ever terror attack in Pakistan. AFP PHOTO / A MAJEED (Photo credit should read A Majeed/AFP/Getty Images) (credit:A MAJEED via Getty Images)
(02 of12)
Open Image ModalPeople attend a funeral of a student killed in Tuesday's Taliban attack on a school in Peshawar, Pakistan, Wednesday, Dec. 17, 2014. Pakistan is mourning as the nation prepares for mass funerals for over 140 people, most of them children, killed in a Taliban attack on a military-run school in the country's northwest. A three-day official mourning period started Wednesday, a day after seven Taliban gunmen, explosives strapped to their bodies, stormed the army public school. (AP Photo/Mohammad Sajjad) (credit:ASSOCIATED PRESS)
(03 of12)
Open Image ModalA family member of students killed in Tuesday's Taliban attack on a school prepares for their burial in Peshawar, Pakistan, Wednesday, Dec. 17, 2014. Pakistan is mourning as the nation prepares for mass funerals for over 140 people, most of them children, killed in the Taliban attack on a military-run school in the country's northwest. A three-day official mourning period started Wednesday, a day after seven Taliban gunmen, explosives strapped to their bodies, stormed the army public school. (AP Photo/Mohammad Sajjad) (credit:ASSOCIATED PRESS)
(04 of12)
Open Image ModalPakistan shopkeepers offer prayers for Tuesday's Taliban attack victims in Peshawar, Pakistan, Wednesday, Dec. 17, 2014. Pakistan is mourning as the nation prepares for mass funerals for over 140 people, most of them children, killed in the Taliban attack on a military-run school in the country's northwest. (AP Photo/Mohammad Sajjad) (credit:ASSOCIATED PRESS)
(05 of12)
Open Image ModalPeople attend funeral of a student killed in Tuesday's Taliban attack on a school in Peshawar, Pakistan, Wednesday, Dec. 17, 2014. Pakistan is mourning as the nation prepares for mass funerals for over 140 people, most of them children, killed in the Taliban attack on a military-run school in the country's northwest. A three-day official mourning period started Wednesday, a day after seven Taliban gunmen, explosives strapped to their bodies, stormed the army public school. (AP Photo/Mohammad Sajjad) (credit:ASSOCIATED PRESS)
(06 of12)
Open Image ModalPakistani students pray during a special ceremony for the victims of Tuesday's school attack in Peshawar, at a school in Lahore, Pakistan, Wednesday, Dec. 17, 2014. Pakistan is mourning as the nation prepares for mass funerals for 141 people, most of them children, killed in a Taliban attack on a military-run school in the country's northwest. (AP Photo/K.M. Chaudary) (credit:ASSOCIATED PRESS)
(07 of12)
Open Image ModalPeople attend funeral of students killed in Tuesday's Taliban attack on a school prepare for their burial in Peshawar, Pakistan, Wednesday, Dec. 17, 2014. Pakistan is mourning as the nation prepares for mass funerals for over 140 people, most of them children, killed in the Taliban attack on a military-run school in the country's northwest. A three-day official mourning period started Wednesday, a day after seven Taliban gunmen, explosives strapped to their bodies, stormed the army public school. (AP Photo/Mohammad Sajjad) (credit:ASSOCIATED PRESS)
(08 of12)
Open Image ModalPeople carry a body of a student killed in Tuesday's Taliban attack on a school in Peshawar, Pakistan, Wednesday, Dec. 17, 2014. Pakistan is mourning as the nation prepares for mass funerals for over 140 people, most of them children, killed in a Taliban attack on a military-run school in the country's northwest. A three-day official mourning period started Wednesday, a day after seven Taliban gunmen, explosives strapped to their bodies, stormed the army public school. (AP Photo/Mohammad Sajjad) (credit:ASSOCIATED PRESS)
(09 of12)
Open Image ModalPESHAWAR, PAKISTAN - DECEMBER 16: Pakistani people attend the funeral for a victim of a Taliban assault on an army-run school in the northwestern city of Peshawar, Pakistan, on December 16, 2014. Taliban attack on an army-run school in Pakistan on Tuesday has left at 141 people dead, including 132 students and nine staff members. (Photo by Muhammad Asad/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
(10 of12)
Open Image ModalPakistani mourners pray during the funeral of a victim following an attack by Taliban gunmen on a school in Peshawar on December 16, 2014. Taliban insurgents stormed an army-run school in Pakistan, killing at least 141 people, almost all of them children, in Pakistan's bloodiest ever terror attack. Survivors described how the militants went from room to room shooting children as young as 12 during the eight-hour onslaught at the Army Public School in the northwestern city of Peshawar. AFP PHOTO/ HASHAM AHMED (Photo credit should read HASHAM AHMED/AFP/Getty Images) (credit:HASHAM AHMED via Getty Images)
(11 of12)
Open Image ModalRelatives carry the coffin of Pakistani army officer Lieutenant Colonel Zahir Shah, who was killed in a suicide bomb attack in Fateh Jang, during his funeral ceremony on the outskirts of Peshawar on June 5, 2014. A suicide bomb attack on an military vehicle killed five people including two senior army officers near Pakistan's capital Islamabad on June 4, officials said. AFP PHOTO/A MAJEED (Photo credit should read A Majeed/AFP/Getty Images) (credit:A MAJEED via Getty Images)
(12 of12)
Open Image ModalPakistani policemen carry the coffins of their colleagues who were killed in an overnight ambush during a funeral in Peshawar on April 22, 2014. Unidentified gunmen killed five police officers on patrol in Pakistan's troubled northwest late April 21, police said. AFP PHOTO/HASHAM AHMED (Photo credit should read HASHAM AHMED/AFP/Getty Images) (credit:HASHAM AHMED via Getty Images)
Army commandos fought the Taliban in a day-long battle until the school was cleared and the attackers dead.
The government declared a three-day mourning period, starting Wednesday. Overnight, the body of the school principal, Tahira Qazi, was found among the debris from the rampage. Her death raised further the earlier reported death toll of 141.
The Taliban said the attack was revenge for a military offensive against their safe havens in the northwest, along the border with Afghanistan, which began in June. Analysts said the school siege showed that even diminished, the militant group still could inflict horrific carnage.
After the attack, Pakistani Army commandos fought the Taliban in a day-long battle until the school was cleared and the attackers dead.
The attack drew swift condemnation from around the world. President Barack Obama said the "terrorists have once again showed their depravity."
Pakistan's teenage Nobel Peace laureate Malala Yousafzai — herself a survivor of a Taliban shooting — said she was "heartbroken" by the bloodshed.
Pakistani Prime Minister Nawaz Sharif lifted te country's moratorium on the death penalty in the wake of the attack pledged to step up the campaign that — along with U.S. drone strikes — has targeted the militants.
"We will take account of each and every drop of our children's blood," said Sharif, who rushed to Peshawar shortly after the attack to offer support for the victims.