More than 40 people have joined Southern District Police in an attempt to find missing Dunedin man Gordon Mclean.
The authorities admitted they have serious concerns about the 63-year-old, who is also known as 'Gordy', after he went missing from Wakari Hospital on Taieri Road at approximately 3pm on Thursday afternoon.
After several hours since he was last sighted, more than 40 people had joined the search for Gordy, including LandSAR volunteers and police staff.
A police spokesperson said: "We are concerned Gordy may have fallen and ask residents to check their properties thoroughly, particularly in the Halfway Bush area.
"He is approximately 152cm tall, of very thin build, and considered frail."
He was last seen wearing a dark-coloured polar fleece and trousers, and a red-coloured polo shirt. He had brown slippers on and a black, sleeveless puffer jacket.
The search continued overnight, and police are asking for any sightings to be reported to immediately.