Officers searching for an Invercargill man missing for over a month want to talk to two people who were in the area where he was last seen.
Raymond Horn went missing in central Invercargill on 15 February.
He was last spotted by CCTV cameras in Queens Park between 10.20am and 11am that day.
The 68-year-old has dementia and is non-verbal.
Invercargill police today released CCTV footage of two people in the playground area of the park just before 2.30pm on 15 February.
Senior constable David Loader said they might have clues to Horn's whereabouts.
"Despite an extensive search, unfortunately [Horn] has not yet been located," he said.
"Police would like to identify and speak to this couple, as they may have seen Raymond and be able to provide valuable information regarding his movements that day."
Anyone with information that can help identify the duo in the CCTV footage is asked to call police on 105 and quote file number 210215/8028.
On 25 February, police used a drone to map and search areas east of Queens Park, though the search area was widened over coming days.
When Horn went missing he was thought to be wearing a light-coloured polo shirt, a black and red jacket, gym shoes and sweatpants or jeans. He walked with a shuffle.