CHARSADDA, Pakistan >> Pakistani officials say the death toll in a brazen attack on a university that is underway in the country’s northwest has risen to six, with several people wounded.

Deputy Commissioner Tahir Zafar says the attack began shortly after the university opened in Charsadda town, some 21 miles outside the city of Peshawar.

Police and army are exchanging gunfire with the attackers on the campus where several explosions were heard from the area of the Bacha Khan University.

Pakistani army says the attackers have been contained in two university blocks and that four of them have been killed.

No one has claimed responsibility for the attack.

A Taliban attack on a school in Peshawar in December 2014 killed over 150 people, mostly children.