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The driver, Saman Chanput, was arrested several hours after the accident and charged with reckless driving causing deaths and injuries, failing to stop to help others and failing to report the accident, police said. He had fled the scene, but after being arrested told police he had run to try to get a fire extinguisher from another vehicle, but panicked and ran away when the fire went out of control before he could get any help.
Authorities were investigating if the fire might be caused by negligence by the bus company as well as the driver, and will press charges against all parties responsible, acting police chief Kitrat Phanphet said at a press conference.
While an initial investigation suggested that the driver was not speeding, police found 11 natural gas canisters inside the bus that had a permit to install only six, Kitrat said. Many Thai vehicles use NGV — also called CNG, compressed natural gas — for fuel.
Police have not officially concluded what was the cause of the fire, but have said the driver told investigators he was driving normally until a front tire malfunctioned and set the bus off balance, at which point it hit a car and then scraped against a concrete highway barrier. The sparks from the friction might have set off the highly flammable gas canisters, and ignited the blaze, police said.
Kitrat said the fact that the driver did not immediately stop after feeling he was losing control of the bus could be grounds for negligence.
An inspection of the bus found that its emergency exit could be opened, but it wasn’t clear if it worked properly, said chief of police forensics Trairong Phiwpan. He also said they did not find any emergency window breakers.
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