About 13 people were injured in agrenade attack Monday in Quetta, capital of Pakistan's southwestern Balochistan province, the private TV channel Geo reported Monday.

Geo quoted police sources as saying that all the injured were from law-enforcement agencies, either police or paramilitary troops.

An unidentified man riding on the back of a motorcycle threw the grenade at the truck in which the law-enforcement officers were traveling on a busy road.

Quetta has been the most violent and bloodiest city in Pakistanin the past two years. About 100 Shiites were killed in ten months in two separate suicide attacks.

Source: Xinhua