The attack took place early Wednesday on the campus of Bacha Khan University in Charsadda town in the northwestern province of Khyber-Pakhtunkhwa.
Umer Mansour, Taliban spokesman told journalists that the attack was revenge for the death of militants at the hands of Pakistani security forces.
The attack took place on the campus of Bacha Khan University in Charsadda town in the northwestern province of Khyber-Pakhtunkhwa, an area that has long been a stronghold of militants.
A police officer said on condition of anonymity that more than 1,000 students were on campus when the shooting started and more than 19 people were killed.
Pakistan, which has suffered from years of jihadist militant violence, has killed and arrested hundreds of suspected militants under a major crackdown launched after the massacre of school children in December 2014 in Peshawa