The two men attacked and killed in a south Auckland pawn shop have been named.
Detective inspector Dave Lynch said the investigation into the deaths Paul Fanning, 69, and Paul Matthews, 47, at the Ezy Cash store in Takanini will take weeks and they are still appealing for witnesses to come forward.
He said police are also searching for a blood-spattered brown hooded top with a Dickies logo on it, which they think was discarded near the Avondale racecourse.
A 25-year-old man has since been arrested and he will face two charges of murder when he appears at the Manukau District Court on Monday.
Police understand Mr Fanning owned the Ezy Cash store on Great South Road and Mr Matthews worked there.
Mr Lynch will not reveal how the pair died, saying their post-mortems are underway.
However, he said they died a violent death and police have since recovered a sharp object they're calling an object of interest.
Mr Lynch said the arrested man is the same one seen leaving the store with a woman on Saturday.
That woman is assisting police with their enquiries. Mr Lynch said they're treating her as a witness, she is in a relationship with the arrested man and was known to the two victims.
