The police Serious Crash Unit had been notified and Worksafe are investigating.
A construction worker was trapped and critically injured after an accident involving a large piece of machinery in Massey today.
The accident took place on a construction site on Mamaku Drive in Massey about 3pm.
The man was driving a soil compactor when it rolled down a hill trapping him underneath, Newshub reported.
St John said the man was taken to hospital in a critical condition.