Investigations are continuing into the bomb scare which paralysed Dunedin International Airport for five hours on Thursday.
More than 300 passengers had their travel plans disrupted, including many trying to make international connections, after a hoax bomb was found in a toilet.
Detective Sergeant Neil Lowden, of Mosgiel, said CCTV footage was being reviewed, as was forensic evidence taken from the scene, and interviews with witnesses were continuing.
The investigation was "in the early stages".
Airport operations manager Richard Roberts said about 30 CCTV cameras operated in and around the terminal building.
The entrance to the toilet had "reasonable coverage", but there are no cameras inside the toilet, Mr Roberts said.
