A 31-year-old man died in hospital on Saturday, a day after two men were pronounced dead at the scene.

The men were travelling inside a Toyota Prado with five others about 6.20am on Friday, when the vehicle left the roadway and rolled several times.

Police yesterday confirmed two of the other occupants remain in a critical condition in hospital. 

Three others are also in hospital after being treated for minor injuries that included a fractured collarbone and abrasions.

It is believed the crash victims are from Afghanistan, although police have not been able to confirm that information.

A report will now be prepared for the Coroner and police investigations into the cause of the accident are continuing.

Emergency services were called to the crash 55 kilometres west of Griffith - between Merriwagga and Goolgowi - just after 6.20am on Friday.

Griffith Local Are Command Inspector John Wadsworth said: "About 6.30am the vehicle - an eight-seater Toyota Prado - was travelling northbound along the Kidman Way, north of Goolgowi, and driven by an unknown male".

"It was carrying what we believe to be seven passengers. The vehicle appears to have left the roadway and rolled a number of times, ejecting passengers," Inspector Wadsworth said.

A spokeswoman for the Ambulance Service of NSW said paramedics were called out at 6.23am.

Nine people were initially reported as having been attended to by paramedics, however that figure was later revised to eight.

ASNSW duty operations manager Andrew Long said four patients were taken to Griffith Base Hospital by road and another two were airlifted.

"Two patients, both males aged in their 40s, suffered life-threatening injuries - one with head and spinal injuries, the other with head and abdominal injuries," Mr Long said.

Emergency services were required to transport blood from Wagga to Griffith to assist medical staff treat patients.

The Kidman Way was closed in both directions until 4pm on Friday.