Police said the accident happened at 1am on the Mahasarakham-Borabua Road in front of a PTT petrol station in Ban Nong Chik village in Tambon Kaeng Ling Jan of Mueang district. 
Four of the passengers had severe injuries. The 32-seat coach of Nakhonchai Air Co was transporting passengers to Mukdahan when the accident happened. 
Accident witness Kosit Laosuwan told police that the trailer was taking away a bulldozer that had completed work in front of the petrol station. Kosit, a foreman of a tap water pipe laying project, said the trailer was hit when it was moving into the right-hand lane to make a u-turn.

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17 injured in bus crash in Mahasarakham

An air-conditioned bus from Bangkok crashed into the rear of a tractor-trailer that was changing lane for a u-turn in Mahasarakham, injuring 17 people early Thursday.