A truck has collided with a bus in southern Bolivia, killing at least 31 people, according to police - just two days after a deadly crash claimed at least 37 lives.
Officers said the bus rolled some 500m (1,640ft) down a ravine after the collision on Monday, which took place on the highway between Oruro, in the Bolivian Altiplano, and the highland mining city of Potosi.
The driver of the truck has been arrested, while the cause of the accident is under investigation.
Police spokesperson Limbert Choque said men and women were among the dead, and 22 people suffered injuries.
Bolivia's President, Luis Arce, expressed condolences for the victims on social media: "This unfortunate event must be investigated to establish responsibilities," he said in a post on Facebook.
"We send our most sincere condolences to the bereaved families, wishing them the necessary strength to face these difficult times."
On Saturday morning, a crash between two buses killed more than three dozen people in the same region.
It happened between Colchani and the city of Uyuni, a major tourist attraction and the world's largest salt flat.
Coincidentally, one of the buses was heading to Oruro, where one of the most important carnival celebrations in Latin America is currently taking place.
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More than 30 people were also killed after a bus crash on 17 February.
In that crash, police said the driver appeared to have lost control of the vehicle, causing it to drop more than 800m (2,600ft) off a precipice in the southwestern area of Yocalla.
Bolivia's mountainous, undermaintained and poorly supervised roads are some of the deadliest in the world, claiming an average 1,400 fatalities every year.
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