A person has been airlifted to hospital with critical injuries following a serious three-car crash that closed SH1 north of Wellsford.
Police said the accident happened shortly before 2.30pm at the intersection of Waimanu Road and SH1.
Officers were at the scene and said one person had been airlifted to hospital with critical injuries, while a second person was reported to be in a serious condition.
Diversions were in place at SH1 and Mangawhai Road and at SH1 in Kaiwaka.
Police advised motorists to take extra care as heavy rain around the greater Auckland area was making the roads slippery.