One of the victims of the violent Pakistan university attack has been named as Syed Hamid Hussain, a professor in the chemistry department.
Two of his students spoke about how he tried to save them and fight off the attackers at the Bacha Khan University in Charsadda.
On Wednesday, suspected Taliban gunmen stormed the campus, killing at least 20 people and injuring 51.
After security officials entered the university, a gun battle lasting several hours took place. Four gunmen were killed, the army said.
Recalling the moment he first heard gun shots, Zahoor Ahmed, a geology student,told AFP that Dr Hamid, 34, told him not to leave the building.
Mr Ahmed said: “[Dr Hamid] was holding a pistol in his hand.”
“Then I saw a bullet hit him. I saw two militants were firing. I ran inside and then managed to flee by jumping over the back wall.”
Another student said they saw the professor fire at attackers with his gun.
People took to Twitter to pay their respects to Dr Hamid.
One user said Pakistan had "lost an asset", while another called him a "martyr of education".