Detectives from Major Crash are continuing to investigate the circumstances around the fatal crash in Palmerston yesterday morning.

Police will allege that the Nissan X-trail was carrying 2 females, aged 40 and 45, and a male aged 37, when it collided with a Toyota Coupe driven by a 19-year-old male.

The 45-year-old female was located deceased in the back of the vehicle immediately following the crash. The circumstances of her death are believed to be non-suspicious, and a direct result of the crash.

Detectives have now confirmed that the Nissan X-trail was a Northern Territory registered hire car that had not been returned after it was hired in November last year. It had since had its number plates switched to a South Australian registration.

Investigations into the crash remain ongoing and police are currently awaiting toxicology results to determine if alcohol or drugs were a factor in the crash.