"We are also urging residents in the area to search their properties and advise us if they find any sharp instrument that could have been used as a weapon and that has been discarded by the person or people responsible.
"One focus of the team today is on tracking the movements of a red Toyota utility that left the Renton Rd address shortly after the fatal attack that occurred at about 12.15am on Thursday, December 3."
Police wanted to hear from anyone who saw it in the vicinity around the same time of the attack or travelling on upper North Island roads over the past four days.
Mr Cahill said it was important people remember that a young man died outside a home in a suburban street and another was seriously injured and that the killer had not yet been identified or located.
Police have returned to the scene this morning and are appealing to residents for any information to solve the crime.
People are also encouraged to call Avondale CIB on 09 820 5784 or Crimestoppers anonymously on 0800 555 111 with any information.