At least 141 people were killed including 132 children whereas 121 were killed and 121 people were injured when Taliban militants, wearing suicide jackets and equipped with heavy weapons, stormed Army Public School in Peshawar.
Nine staff members including the school principal were also amongst the deceased.
All seven militants were also killed in the operation that was carried out by Pakistan Army in the school.
Tehreek-e-Taliban Pakistan (TTP) has claimed responsibility for the attack. The militant group has stated that the attack was carried out to avenge the military operation in the tribal areas of the country.
More than 1000 militants have been killed in the operation launched by Pakistan Army earlier this year.
Political parties and leadership of the country also denounced the heinous attack on the school. Prime Minister Nawaz Sharif has termed Peshawar school attack as a national tragedy and announced three day mourning against the attack on the military-run school.
An All-Parties Conference has also been called by the Prime Minister on Wednesday.
PM Sharif said that the children who were killed were his children and the loss was his loss.
Chief of Army Staff General Raheel Sharif termed the attackers as enemies of Pakistan but also of humanity. He had also said that terrorists have hit the heart of the nation.
Director General of Inter-Services Public Relations (ISPR) Asim Bajwa said that the militants were neither humans nor Muslims. He termed the incident as the darkest day of the history.
The incident was condemned across the world as well. Indian Prime Minister Narendra Modi telephoned Prime Minister Nawaz Sharif to express condolence on the attack on the Army Public School.
Secretary General of United Nations Ban ki-Moon said that the incident was an act of horror and cowardice to attack defenseless children while they were acquiring education.
President of the United States Barack Obama said that his country stands with Pakistan in its struggle against terrorism.
Pakistan’s Nobel Peace Prize winner Malala Yousafzai said that she was heartbroken by the killings of innocent people and children.
Political parties in the country have also called off their events as a sign of protest against the incident.
Shutter down strikes are also being observed in many parts of the country whereas several district bars in the country are also observing strikes.
Prayers are also being offered for the victims of the Peshawar school attacks in schools and mosques in the country.
Candle light vigils are also being held in the country for the victims of the heinous attack.