Copper thieves have struck the Bay of Islands Hospital and stripped a building of valuable downpipes.
About 12 metres of 10cm-diameter copper downpipes were stolen from the community mental heath facility in Kawakawa's hospital complex on Monday night.
Senior Sergeant Peter Robinson, of Kerikeri police, said the health board's fixed budget meant extra maintenance and repairs resulted in less money for other areas, potentially affecting health programmes.
"They're attacking a public asset that provides a service to the community, possibly also to their own family and friends," Mr Robinson said.
Local scrap dealers had been contacted and asked to be on the alert.