Islamabad, Aug 9 (IANS): At least two policemen were killed and over 10 others injured when a blast went off in Pakistan's southwest Quetta city on Sunday night, according to hospital and police officials.

Waseem Baig, spokesperson for the Civil Hospital Quetta, said that at least 11 people including six policemen were injured in the blast that occurred near the Unity Chowk area of Quetta, the capital city of the country's southwestern Balochistan province.

The attack happened when a police mobile on a routine patrol was passing by the blast site, the police officials in the area told local media.

Police said that explosive material was fixed in a motorbike, adding that the police vehicle was targeted in the attack, the Xinhua news agency reported.

Security forces and rescue teams rushed to the site and shifted the injured to the Civil Hospital in the city.

Security forces cordoned off the area and kicked off a search operation.

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