At least 31 people died in southern Bolivia today NZT when their bus plunged into a ravine after colliding with a pick-up truck, bringing to nearly 70 the number killed on area roads in recent days, investigators said.

At least 31 people died in southern Bolivia Monday when their bus plunged into a ravine after colliding with a pick-up truck, injuring 22 people, bringing to nearly 70 the number killed on area roads in recent days,

At least 25 people were killed and 26 injured in Bolivia on Monday when the bus they were travelling in plunged into a ravine after colliding with a pick-up truck, investigators said. The crash was the second in days in southern Potosi department to claim dozens of lives -- and the third in just a month.

Two passenger buses collided on Saturday on a highway in southern Bolivia, leaving at least 37 people dead including eight minors, police said, in the country's worst bus accident to date this year. "So far we have 37 confirmed deaths,

President Luis Arce said incident would be investigated to establish responsibilities. Driver of the truck has been arrested, police said.

The crash occurred just days after more than three dozen people were killed in the same region after two buses collided.