No one was hurt in the crash.
There will be a "visible police presence" in the area for the next few hours.
The man suffered an anoxic brain injury after inhaling the fumes of a hydrocarbon-based degreaser which has left him unable to work.
Detectives ask anyone who finds dark tights, red socks and cell phone to contact police.
Officers are appealing to the public for information after an attack in the town of Richmond overnight.
The arrests come after a five-week investigation.
They protect boaties along the largest coastal area in New Zealand.
Banshee's owner slipped in the wet, and lost the lead - the dog went on to vicously attack a sheep.
The bird was the culinary champion at an annual game bird food night.