The accident that occurred in the North-South Expressway near Bukit Tagar on Monday was caused by the lethargic driver who was sleepy and tired.

Selangor police traffic division spokesperson confirmed this matter after conducting early investigation on the fatal accident.

In the 3.10am accident, the bus lost control and hit the road divider, killing three of its passengers.

Mohamad Zambri Abd rani, 42, Mohamed Ainol Fauzie Mohd Aman, 25, and a yet to be identified woman died on the spot while 14 others sustained minor injuries.

The driver who suffered from serious injuries and was sent to the Slim River Hospital.

Those who sustained minor injuries, were allowed to continue their journey after receiving treatment.