Police say road accident involving 2 trucks, 2 buses in SW Pakistan has killed at least 25

Pakistani police say at least 25 people died and over 30 were injured in a multi-vehicle collision involving two trucks and two passenger buses on a coastal highway in the country's southwest.

Senior officer Ahmed Nawaz says the accident took place early on Saturday near the town of Gadani, when a bus bound for the port city of Karachi collided head-on with a truck coming from the opposite direction.

Nawaz says the second bus and truck then piled up onto the two vehicles and all caught fire, mainly because the buses were also smuggling Iranian gasoline- and diesel-filled canisters on board.

He says most of the victims were severely burned and that the death toll may increase.

Bad road infrastructure and poor driving often cause accidents in Pakistan.