There's still no sign of a man missing from a Dunedin hospital as the Southern DHB reviews how he was allowed to leave.
Gordon Mclean, 63, known as Gordy, has not been seen since leaving Wakari Hospital about 3pm on Thursday.
On Sunday morning a police spokeswoman said he had still not been found.
Southern DHB's medical director for mental health, addictions and intellectual disability, Brad Strong, said Mr McLean had been in a non-secure rehabilitation facility.
There would be a review of the disappearance, he said.
"Our focus at this stage is on working with the police," Dr Strong said.
"However, we will be fully reviewing the circumstances around his departure and care in light of these events."
About 60 volunteers from Land Search and Rescue, the Red Cross and a rescue dog combed Wakari, Helensburgh, Halfway Bush Kaikorai Valley and Frasers Gully on Saturday.
Dunedin Marine Search and Rescue were also checking waterways and culverts, Sergeant Richard Panting said.
Police have described Mr Mclean, 152cm tall and thin, as "very frail".
They say they have serious concerns for his welfare.
When he was last seen, Mr Mclean was wearing a dark-coloured polar fleece and trousers, a red-coloured polo shirt, brown slippers and a black sleeveless puffer jacket.