Police have deployed a drone in the search for missing Invercargill man Raymond Horn.
Officers have serious concerns for the 68-year-old who went missing from his home on 15 February.
Horn has dementia and is non-verbal.
CCTV showed him walking through Queens Park between 10.20am and 11am on 15 February.
Police said an urban search and rescue drone was mapping and searching areas east of Queens Park today, though the search area would be widened over coming days.
Police are urging anyone who may have seen Horn or have information about his whereabouts to come forward.