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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