When one of them drowned, the two others tried to rescue him but met with the same fate, witnesses said
Police said the car carrying 55-year-old Fazlur Rahman collided with a loaded truck at Fatikchari Upazila on Saturday.
The accident, which took place around 7am, left four others injured.
They are Chittagong Primary Teachers' Training Institute (PTI) Superintendent Rafiqul Islam Talukder, Patiya PTI Superintendent Mushfeka Binte Sultan, PTI staffer Saiful and driver Ali Hossain.
They were on their way to the hill tract district of Khagrachari when the car crashed into the truck loaded with iron roads near the Fatikchari town.