Rescue workers transport a wounded man to a hospital following an attack by gunmen on Bacha Khan University in Charsadda, Pakistan, on Wednesday, January 20. HASHAM AHMED/AFP/AFP/Getty Images

The body of a victim lies in the back of an ambulance while Pakistani troops gather at the main gate of Bacha Khan University. Mohammad Sajjad/AP

Rescue workers move an injured victim to an army ambulance. HASHAM AHMED/AFP/Getty Images

Rescue workers carry an injured victim from the university. A MAJEED/AFP/Getty Images

Rescue workers shout to clear the way for an ambulance transporting an injured victim. Mohammad Sajjad/AP

People gather around as policemen move the bodies of attackers. AAMIR QURESHI/AFP/Getty Images

Pakistani soldiers lead people from the university. A MAJEED/AFP/Getty Images

Policemen stand at the bottom of stairs splattered with blood where militants were killed. AAMIR QURESHI/AFP/Getty Images

Police and onlookers gather in front of a hospital following the attack. HASHAM AHMED/AFP/Getty Images

An army helicopter arrives at Bacha Khan University. AAMIR QURESHI/AFP/Getty Images

A woman cries after her son was injured in the attack. B.K. Bangash/AP

Soldiers conduct a search operation at the university. A MAJEED/AFP/Getty Images