The accident occurred at an unmanned railway crossing close to the city of Sheikhupura in Pakistan's largest province, Punjab.
Bolivia has a sorry record when it comes to highway safety, and crashes involving buses travelling at night are common.
Pictures and video footage shared online and posted on the websites of private radio stations showed the mangled remains of the bus with its seats scattered in the bed of a river.
"Fourteen deaths were reported at the scene of the accident, 33 injured were transferred to the hospital in Villa del Rosario, where four of them died," police said after a crash in Zulia state which borders Colombia.
At least 15 people were killed when a tourist coach crashed along a winding road in west Bulgaria, the health ministry says.
Chief Minister of Uttarakhand state Trivendra Rawat said the overcrowded bus fell into a 700-foot (213-metre) deep gorge in the Himalayan foothills.
A bus carrying more than 40 people hit a motorbike while heading down a hill and rolled over multiple times in Java island, killing at least 27 and injuring 16 others.
The two vehicles were carrying around 100 passengers when they crashed head-on in Khanpur, some 800 kilometres south of the capital, Islamabad.
A passenger bus rolled backward and then slipped off a thin road in Nepal's mountainous region. At least 85 passengers were sitting inside the bus and on its roof.
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