Pakistani troops clear way for an ambulance transporting a lifeless body of a victim from Bacha Khan University in Charsadda town, some 35 kilometers (21 miles) outside the city of Peshawar, Pakistan, Wednesday, Jan. 20, 2016 (AP)
Pakistani rescuers shift an injured victim outside the Bacha Khan university following an attack by gunmen in Charsadda, about 50 kilometres from Peshawar, on January 20, 2016 (AFP)
Soldiers gather outside Bacha Khan University where an attack by militants took place, in Charsadda, Pakistan, January 20, 2016. (Reuters)
Ambulances are seen outside Bacha Khan University where an attack by militants took place, in Charsadda, northwestern Khyber Pakhtunkhwa province, Pakistan in this still image taken from a video January 20, 2016. (Reuters)
Pakistani rescuers shift an injured man to a hospital following an attack by gunmen in the Bacha Khan university in Charsadda, about 50 kilometres from Peshawar, on January 20, 2016 (AFP)
Pakistani troops arrive at Bacha Khan University in Charsadda town, some 35 kilometers (21 miles) outside the city of Peshawar, Pakistan, Wednesday, Jan. 20, 2016 (AP)
Soldiers gather outside Bacha Khan University where an attack by militants took place, in Charsadda, northwestern Khyber Pakhtunkhwa province, Pakistan in this still image taken from a video January 20, 2016. (Reuters)
An ambulance transports the body of a victim while Pakistani troops gather at the main gate of Bacha Khan University in Charsadda town, some 35 kilometers (21 miles) outside the city of Peshawar, Pakistan, Wednesday, Jan. 20, 2016 (AP)
Pakistani rescuers shift an injured man to a hospital following an attack by gunmen in the Bacha Khan university in Charsadda, about 50 kilometres from Peshawar, on January 20, 2016. At least 21 people died in an armed assault on a university in Pakistan on January 20 (AFP)