At least four policemen were shot dead by unidentified assailants in Quetta's Killi Deba area, on Thursday, DAWN reported.

The gunmen opened indiscriminate fire at the police mobile while it was patrolling the area, Deputy Inspector General of Police Abdul Razzak Cheema said.

Police and Frontier Corps personnel reached the site and started an investigation into the incident. 

No group has claimed responsibility for the attack yet.