IN PHOTOS: Tragic scenes from the Pakistan massacre

PESHAWAR, Pakistan — Seven Taliban gunmen, explosives strapped to their bodies, stormed a military-run school in the northwestern Pakistani city of Peshawar on Tuesday, killing more than 100, officials said, in the highest-profile militant attack to hit the troubled region in months.

Pakistan is mourning as the nation prepares for mass funerals the victims, most of them children, a day after the attack.

Prayer vigils were held across the nation and in other schools, students spoke of their shock at the carnage.

The gunmen 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. The attack was the deadliest slaughter of innocents in the country and horrified a nation already weary of unending terrorist assaults. 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.

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 laborer 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 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.

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.

Even Taliban militants in neighboring Afghanistan decried the killing spree, calling it "un-Islamic."

Pakistani Prime Minister Nawaz Sharif 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.

In neighboring India, which has long accused Pakistan of supporting anti-India guerrillas, schools on Wednesday observed two minutes of silence for the Peshawar victims at the urging of Prime Minister Narendra Modi, who called the attack "a senseless act of unspeakable brutality." - Rebecca Santana, Riaz Khan with reports from Munir Ahmed in Peshawar, Asif Shahzad in Islamabad and Tim Sullivan in New Delhi

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Photos by Mohammad Sajjad, Associated Press unless otherwise stated