Auckland police are working with Child, Youth and Family following the discovery of five children, including an eight-month-old baby, living at a property that had a methamphetamine lab on it.
The lab was uncovered after a fire broke out last weekend in the garage of a Mangere residence causing extensive damage to the garage and a sleepout.
One person was taken to hospital with chest pains but released a short time later.
Detective Senior Sergeant Albie Alexander says it's alarming to hear that five children have been living in such an unsafe and unhealthy environment.
Police have charged a 39-year-old man with the possession of precursor materials and equipment.
Forensic investigators have been on the scene and further charges could be laid.