A man who caught two people breaking into his van early this morning was taken to hospital after an altercation that also left one of the alleged thieves with a life-threatening injury.
Police were called just after 4am to a vehicle break-in on Te Atatu Rd in West Auckland, close to the northwestern motorway.
A spokeswoman said a person reported two men were breaking into his vehicle.
After an altercation the alleged thief and van owner were taken hospital.
Police want to talk to witnesses and said the alleged thief remains in a critical condition.
The van owner has since been discharged.