Bus accident in Laos

Bus accident has occurred on the  Road 13th from Vientiane Province to Xiengkuang, the accident kills  4 people and more than 10 passengers injured. the bus set out from xiengkuang at 8 pm and would arrive at 4 am, totally 8 hours, the reason in the initial investigation is the driver might fall asleep due to tiredness . according the free radio Asia (Lao)