The father of missing UK woman Grace Millane landed at Auckland Airport on Friday morning and will address reporters about his daughter's disappearance.
David Millane arrived in New Zealand at 7am and was met by members of the police.
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Ms Millane was last seen in Auckland Central at Sky City on Saturday night, and was reported missing to police by her family in Essex on Wednesday.
Det Insp Scott Beard told media that 25 personnel were on the case, scouring central CCTV footage for any sighting of the woman.
"We're still hopeful that we'll find Grace - but the longer it goes on, the more worrying it is," he said.
Ms Millane was last seen wearing a black dress and white Converse-style shoes, and Det Insp Beard appealed to the public about sightings of someone matching her description.
She had been staying at an Auckland CBD backpackers, in a room with at least three others. Some of her belongings were still in the room, but police wouldn't comment on what they were.
Her brother Michael said it was unusual for Ms Millane to not respond to messages on her birthday on Sunday, and she hadn't made any contact since.
"It's really unusual for Gracie, as a family we've spoke every day to each other just via Whatsapp, just about the usual conversation," he told Newshub.
She had been in New Zealand for two weeks, and recently travelled to the Bay of Islands.