Three Bangladeshis were killed and four others injured following a car crash on an Australian highway on Saturday.

Saiful Islam, Sadeka Kamal Nipa and Maisha Kuddus died after an SUV carrying them rolled on the Kakadu Highway around 12:30pm (local time), reports ABC News and Prothom Alo.

Four others in the vehicle were flown to Darwin, the capital of Australia's Northern Territory.

Although they were in a stable condition at Royal Darwin Hospital, three of them were at the intensive care unit.

Two of the injured might have limbs amputated, and another had a severe head injury, a spokesperson of the hospital told ABC News.

Initial reports from police suggested the driver's inexperience might have played a role in the incident.

NT Police Acting Assistant Commissioner Commander Tony Fuller told reporters that a 29-year-old had been driving a hired Toyota Prado from Jabiru to Cooinda when he "lost control on a large, sweeping bend".

One person was ejected from the car, which raised police concerns as to whether they were wearing seatbelts.¬

"We don't think alcohol is a factor, speed may be a factor, but it's more likely to be the driver is inexperienced.

"We understand the driver is not used to that vehicle, he's more used to driving a smaller vehicle around town," he said.

Mahmudul Hasan, president of Bangladeshi Student Association of Charles Darwin University, told ABC News about 100 people gathered outside the Royal Darwin Hospital following the incident to pray for the injured.

He believed all three who were killed were married, and survived by their spouses, and less than 30 years old.

“It's devastating, that's all I could say,” Hasan said.

“We had another incident just about nine months ago. There was a car crash in Litchfield and we lost one of our brother and sister as well.”