Police are urging anyone who witnessed the three vehicle crash near Whitianga overnight to make contact with them.

A four-year-old girl and a pregnant woman were two of six people injured in the crash on State Highway 25 around Mill Creek Rd, at about 6pm.

Photo courtesy of Google Maps

Police are especially keen to speak with several members of the public that stopped to help who have not already spoken to them.

Both the pregnant woman and the child were flown to Auckland hospitals by the Westpac Rescue Helicopter.

The child passenger is currently in a serious but stable condition at Auckland's Starship Children's Hospital after suffering head injuries.

The pregnant woman suffered minor injuries and was taken to Auckland Hospital's emergency department as a precaution.

Waikato Serious Crash Unit senior constable Graham Fitzpatrick says investigators are working to build up an understanding on the cause of the crash.

Initial indications suggests the pregnant woman was driving on SH25 from Whitianga in a Nissan Bluebird and went to turn on to Mill Creek Rd at about 5.45pm, he says.

'An Isuzu Bighorn SUV travelling in the same direction has collided with the rear of the car.

'The impact of this collision appears to have shunted the car into the opposite lane resulting in a collision with an oncoming Holden Colorado utility.”

Graham says the drivers of both 4WD vehicles were shaken but uninjured in the crash.

Courtesy of Google Maps

Emergency services staff attending the crash acknowledged the several members of the public, including off-duty medical staff, who assisted the injured before they arrived.

He would like to hear from any of these good Samaritans who have not already been interviewed by police.

Due to heavy traffic flows police believe there may be many more people who witnessed the crash than they have so far spoken to.

For that reason investigators are asking those people to contact the Whitianga Police, says Graham.

'The challenge for us is many motorists in this area are visitors or maybe even overseas tourists and we need to speak to them before they leave for home or head out of the country.”

If you witnessed the three-car crash on State Highway 25 at around 6pm on Thursday, October 16, please call Whitianga Police sergeant Andrew Morrison on 07-866-4000

EARLIER:

Six people including a four-year-old girl and pregnant woman were injured in a three-car crash south of Whitianga in the Coromandel overnight.

The crash took place on State Highway 25 at Mill Creek Rd at around 6pm. The woman and child were both airlifted from the scene by the Auckland-based Westpac rescue helicopter.

A seriously injured pregnant woman and four-year-old girl were flown to Auckland hospitals by the Westpac Rescue Helicopter following a three-car crash south of Whitianga overnight. Photo: File

Fairfax reports the four-year-old girl was in a critical condition with head injuries and had been taken to Auckland's Starship Children's Hospital.

The pregnant woman, believed to be in her 30's and related to the child, was taken to Auckland Hospital's emergency department with serious abdominal injuries.

The other four people involved in the crash were treated at the scene by paramedics from Whitianga and Thames.

A St John Ambulance spokesperson says they were assessed and made their own way to medical centres for further treatment.

The child and woman were travelling in the same vehicle and it is believed the car had been badly damaged, reports Fairfax.

Police are still investigating the circumstances of the crash.

The crash was attended by Whitianga firefighters who assisted police with clearing a landing site for the helicopter which was able to land about 500 metres from the site.