Eleven Taliban militants carried out the brutal attack on an army-run school in Pakistan's Peshawar city last week that killed 150 people, mostly children, an initial investigation report has said.
The report, prepared by Anti Terrorism Squad and police, said only seven militants out of the 11 went inside the school campus, while four stayed outside to assist them.
The terrorists began the bloodbath in the school with a suicide blast followed by lethal firing on children, it said.
The four attackers outside the school campus remained there throughout the day and assisted those inside. They eventually managed to escape the scene, according to the report.
The report said the 11 militants were brought to Peshawar early morning on December 16 from Landi Kotal tehsil of Khyber Agency to carry out the deadly attack on Army Public School (APS) that killed 150 people, most of them children.
The terrorists entered Peshawar district through Ghundi Camp, a camp for Afghan refugees, situated behind the APS.
Three of the militants were ferried to Bihari Colony area, also close to the school, in a van first while four more arrived in the area on a re-run of the vehicle.
Both groups are believed to have entered the school at the same time.
According to the report, the attackers entered the school campus around 10.15am local time while the first explosion took place 15 minutes later.
The report added that the militants spent the night before the attack at a nearby mosque and used a ladder to jump into the school building.
"The group had entered the provincial capital from Khyber Agency in a vehicle bearing the registration number E-187 Islamabad and used a ladder to jump inside the school building," the Express Tribune said quoting the report.
The report said six of the seven directly involved in the attack have been identified. Two militants each were from FR Kohat District, Swat and Afghanistan, while one was still unidentified.