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Police investigating a crash which killed two people near Mataura in Southland are calling for sightings of a second car they believe may be linked to the crash.
Two others were injured in the crash, which happened about 5pm on Sunday, and State Highway 1 was closed after a vehicle rolled.
The driver of the crashed car, a Holden Commodore, was seriously injured and flown to Dunedin Hospital.
The front seat passenger suffered moderate injuries and was taken to Southland Hospital by ambulance.
Two rear seat passengers died at the scene. Both were from Mataura, police said today.
As part of their inquiries, police said they were were speaking to the driver of a second car, a red Subaru Impreza station wagon.
Though that car was not directly involved in the crash, initial indications suggested it could be linked, police said.
"Police would like to hear from anyone who saw this car - and the car that crashed - a dark blue Holden Commodore - in the time leading up to the crash.
"The cars are believed to have travelled south through Mataura and Gore prior to the crash."
Anyone who could help was asked to call 105 and quote file number 200126/5431.
Police wanted to thank those who stopped and provided assistance to those involved.
The names of those killed would be released as soon as all necessary family notifications had taken place.