Police are calling on Dunedin residents to help in their search for a man missing for four days after leaving a hospital rehabilitation unit.
Gordon McLean, 63, has been missing since Thursday when he left Waikari Hospital, and despite a search team of about 60 people combing the city and waterways, no sign of the man is yet to be seen.
A full review is to be launched into how McLean, described as "frail", was able to leave the rehabilitation unit.
Southern DHB's medical director for mental health, addictions and intellectual disability Dr Brad Strong said they were "increasingly concerned" for McLean's wellbeing.
He said McLean left the rehabilitation unit in which he was receiving care, and has not returned.