A traffic accident occurred on the E18 highway in Indre Østfold, heading towards Oslo, involving a car that veered off the road and rolled over.
The incident was reported to the police at 8:15 PM.
A woman in her 30s was taken to Østfold Hospital with moderate injuries.
Four other individuals fled the scene before emergency services arrived, with one reportedly seen bleeding from the head.
Police deployed resources, including a helicopter, to locate the missing individuals.
Two of them, who left in a taxi, have been found and appear to have minor injuries.
Authorities are still seeking the remaining two individuals believed to have been in the vehicle.
The car, registered in Sweden, was initially stopped by a traffic patrol for a speed check but lost control shortly after exiting the highway.
The police have concluded that the accident was not a direct result of their intervention.