Most of the students have been rescued and the gunmen are believed to be on the second and third floors of the campus, the police said.  

Media reported that three gunmen entered the Bacha Khan University in Charsadda, Northwestern Khyber Pakhtunkhwa province, and opened fire on students and teachers in classrooms and hostels.

Pakistan has killed and arrested hundreds of suspected militants under a counter-terrorism plan enacted after a massacre of school children in December 2014 in its volatile Northwest.

Deputy Inspector General Saeed Wazir said that the number of gunmen was unclear but police had moved into the university and a gunfight with the attackers was under way.

"We launched an operation inside the university and are trying to rescue the students and staff of the institution," Wazir said.

Shabir Khan, a lecturer in the English department, said he was about to leave the hostel for the department when firing began.

"Most of the students and staff were in classes when the firing began," Khan said.

Read more: Gunmen attack university in Northwest Pakistan

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