A double-decker passenger bus caught fire after colliding with a truck on one of Thailand’s busiest highways on Tuesday, killing 19 people and injuring 23, authorities said.

The bus drivers and most of the passengers were stuck in the bus when it caught fire, police Lt. Assavathep Chantanaree said.

The overnight bus had been heading for Bangkok on the Mitraphab highway in Kaeng Khoi district in the central province of Saraburi. It had departed from Roi Et province in Thailand’s northeast on Monday night.

Kaeng Khoi district chief Passakorn Bunyalak said police believed the driver was dozing off when the accident happened.

After the initial crash, another woman was injured when a pickup truck hit the piled-up vehicles, Mr. Assavathep said.

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