The aftermath of a crash near Blenheim today. Photo / Nelson Marlborough Rescue Helicopter
A 70-year-old woman is in a critical condition after a head-on crash near Blenheim.
Two cars collided near Smiths Overbridge in Redwood Pass at 3.06pm.
A police spokeswoman said originally it was thought two people were trapped, but one person had made it out of the vehicle.
Nelson Marlborough Rescue Helicopter transported a 70-year-old Blenheim woman to Wellington Hospital in a critical condition.
Earlier, police said two people are in a serious condition, while one other had moderate injuries.
"The car was down a bank so it wasn't blocking the road," she said.
Police were diverting traffic off Redwood Pass Rd.
Train control was also advised.
Incident prompts review into Spring Hill Corrections Facility procedure.