LA  PAZ, Oct. 20 (Xinhua) -- Two vehicles collided Wednesday on a highway between  the west Bolivian towns of Oruro and Huanuni, killing 12 people, including three  leaders of the mine workers union, police said.

According  to a preliminary police report, the head-on collision took place near the  community of Sora Sora in the department of Oruro when a station wagon from the  Huanuni Mining Company hit a public transit minibus carrying at least 14  passengers.

One  vehicle was reportedly steered into the opposite lane, leading to the fatal  accident. The death toll may rise due to the critical state of some of the  injured.