At least 16 people were killed when a pickup truck crashed into a tree on a rural road in Thailand’s northeast, according to police.

Police Col. Suthee Setthawong says the pickup truck carrying a number of construction workers slammed into a big tree next to a road in Ban Dan district in Buriram province on Monday.

Police believe the driver fell asleep while driving, he said. Police found a tablet of methamphetamine in his pocket and a bottle of alcohol next to his seat.

Buriram is 300 kilometers northeast of Thailand’s capital Bangkok.

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