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The father of a British tourist missing in Auckland is flying to New Zealand in a bid to find her.
Grace Millane arrived here about two weeks ago and had been in constant contact with her family.
But the 22-year-old was last in contact with her family the day before her birthday, on Sunday, and concerns for her safety are now mounting.
Her father left England Wednesday evening (UK time) and was due to arrive in New Zealand on Friday.
Her older brother Michael Millane told UK news website Echo that the family are finding the uncertainty extremely difficult.
"It's really tough - not nice at all. We all feel a bit helpless from over here. That's why my father is flying out there," he said.
"If she gets this message, we would urge her to get in touch with us as soon as possible so we know she's OK."
Auckland Central Police are due to hold a press conference about the case at 4.30pm today.
Police gave out a description of the young woman, as well as details about the last confirmed sighting of her.
"Grace is a 22-year-old European woman with brown hair and brown eyes. She is approximately 5ft 6in (168cm) in height and 58kg.
"At this stage, Grace was last sighted around 7pm on Saturday, 1 December, on Victoria Street, Auckland CBD.''
Detective Inspector Scott Beard said officers had spent the past 24 hours trying to piece together her last known movements, who she has associated with and the circumstances of her disappearance.
Various sightings of Millane have her last wearing a black top, blue jeans and red sneakers. Others have her in a black dress and white shoes.
Beard said anyone who believes they may have seen Millane on Saturday night or has information about her whereabouts is urged to contact police immediately.
An Auckland woman believes she saw missing woman near the Southern Motorway in Manukau.
The witness, who asked not to be named, told the New Zealand Herald she believed she saw her standing by the Manukau on-ramp.
"Where she was standing, it was really bizarre and she was by herself, nobody around just a girl on her own," she said.
"I can honestly 100 per cent say I saw a young girl, absolutely so close to her description that it's not funny, and there was no way I was going to stop.
"She was in a very unusual place to stand, I would have thought a hitchhiker would have stopped on the left-hand side to get in the car, she was on the other side."
The witness said the young woman, who she believes to have been Millane, did not have her arm out with her thumb stuck up in the air like a hitchhiker.
She could not remember if the young woman had bags with her or not or whether she saw the woman standing by the road on Friday or Monday afternoon.
"I looked at the photo [of Millane] and I was quite adamant I had seen that girl," she said.
"I just saw a young girl and I thought she had like a raincoat ... she had a bigger sort of jacket, not a fashion like one."
Millane's family sparked the investigation into her disappearance yesterday after they became alarmed when she didn't respond to birthday messages on Sunday.
Her older brother said it was completely out of character for her not to be in contact with her family.
Millane was about six weeks into a year-long world trip. Before New Zealand she had spent four weeks travelling in South America.
During that time she had been in touch with her family daily through WhatsApp.
"We tried ringing up the hostel, which is the Base Backpackers in Auckland, which were very helpful trying to track her down," her brother said.
"She hasn't really replied to any messages between the family and it was her birthday on Sunday and she didn't respond to any messages."
The family put the call out there because they were worried for her safety and wanted "to make sure she's alright".
Her brother was not sure of her travel plans in New Zealand, but he knew she had a flexible itinerary booked to travel around most of the country.
She had paid up to stay at Base Backpackers until December 8.
While she was travelling alone, Michael Millane said she had made a lot of friends.
"It is a really hard situation for the family at the moment," he said.
The family had been in "touch constantly" with New Zealand police.
Base Backpackers declined to comment to the Herald on Wednesday.