
Lahad Datu police chief Dzulbaharin Ismail said the accident occurred when the man driving a Toyota Innova, heading from Lahad Datu to Tawau, allegedly overtook several cars before crashing head-on with the trailer.
He said the MPV driver, 40, and two passengers, aged 39 and 43, were confirmed dead at the scene by a medical officer. The boy, who was also a passenger in the Toyota, suffered serious injuries and was sent to Lahad Datu Hospital.
Dzulbaharin said the trailer driver, 56, suffered only minor injuries. The case is being investigated under Section 41(1) of the Road Transport Act 1987 for causing death by reckless driving.