Carterton deputy fire chief Brian Styles said four people also had been involved in a two car collision on Dalefield Rd about 3.20pm involving a late model Commodore sedan towing a caravan and a Nissan SUV.
An elderly man was driving the sedan and his wife was a front seat passenger, Mr Styles said, and two men were travelling in the Nissan 4x4 vehicle.
Both cars received extensive frontal damage and the sedan was damaged along its right hand side as well, he said. The direction the cars had been travelling and the cause of the collision was yet to be established. The driver of the SUV and the elderly couple were taken to Wairarapa Hospital by ambulance for assessment and the other male passenger escaped injury. Police had started a preliminary scene examination.