A British backpacker who was staying in an Auckland hostel has been missing for five days.
Usually she kept in daily contact with her family through the messaging service WhatsApp.
She has not returned to her hostel room in Auckland, New Zealand, and family members have had no contact since Saturday, December 1. "Please share and contact if you have any information regarding her whereabouts".
Detective Inspector Scott Beard said police had no evidence of foul play, but were keeping an open mind.
She was last seen on Saturday about 7.15pm around SkyCity.
"It's important that anyone who recognises Grace from this photo or saw her on Saturday night contacts Police immediately".
Millane had reportedly been staying at Base Backpackers in Auckland.
Various sightings have her wearing either black top, blues jeans and red sneakers, or a black dress with white shoes.
Ms Millane, an advertising and marketing graduate who graduated from the University of Lincoln a year ago, had spent six weeks travelling with an organised group in South America before going to New Zealand alone.
"The longer this goes on the more concerning it is", Beard said.
Ms Millane's brother Michael said: "We are really, really anxious and concerned about Grace".
Grace's father is due to arrive in New Zealand on Friday, reports Stuff.
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.
Ms Millane is about 5ft 6in tall with brown hair and brown eyes.
Michael said his sister last spoke to family last Thursday and has not posted anything on social media since. He said they were waiting for the British banks to update them on when Grace Millane's credit cards were last used.
The family had been in "touch constantly" with New Zealand police.
Base Backpackers were approached by Stuffon Wednesday but declined to comment.