More police are joining the search for 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 police said he had still not been found and they have urgently called for residents in the area to check their properties again.
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.
The search resumed in on Sunday morning with officers from further afield arriving to help, police said.
They have described Mr Mclean, 152cm tall and thin, as "very frail".
Police have serious concerns for his welfare.
Detective Constable Donald Peat on Sunday repeated a call for residents - particularly in the Halfway Bush area - to urgently check their properties, including sheds and outbuildings.
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.