The state-owned vehicle veered off a small bridge after colliding with the roadblock in the dark and fell into a ditch, local superintendent of police Labhu Ram told AFP from the accident site by phone. "The bus caught fire when the diesel tank exploded on impact," he said.
The bus had 64 passengers on board and was on its way from Surpur in southern Karnataka state to the IT hub of Bangalore, 600 kilometres (400 miles) away. At least three surviving passengers were in a serious condition.
State transport minister R. Ashok, who visited the accident site, told reporters that preliminary reports suggested the driver was at fault. "Negligent driving is suspected to have caused the accident as the bus was speeding and hit a road barrier on the bridge and skidded into the ditch," Ashok said.
Police had registered a case against the driver, who survived the accident, Ram added. India has the highest annual road death toll in the world, bigger than the more populous China, according to the World Health Organization, with accidents caused by speeding, bad roads, overcrowding and poor vehicle maintenance.
Police figures show that nationwide more than 110,000 people die annually on the roads.
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