One policeman was killed and nine others were injured when a police van was struck by a bomb in Quetta, the capital city of southwest Pakistan's Balochistan province, on Monday afternoon, Xinhua reported, citing officials. 

The police van was passing by a university when it came under attack by militants, Balochistan government spokesperson Liaquat Shahwani told Xinhua.

Initial media reports said the blast was heard near the gate of Balochistan University.

Shahwani said no students were injured and university buildings remain safe. 

Police forces are now hunting the militants, who fled the scene following the blast.

No group or individual has claimed responsibility for the attack yet.

(With input from Xinhua)