New Zealand police are investigating the disappearance of a 22-year-old British woman during a holiday in Auckland.

The family of Grace Millane, who is from Essex and attended the University of Lincoln, said they have not heard from her since Saturday 1 December.

“Police are releasing a CCTV image as our investigation into the disappearance of 22-year-old English tourist Grace Millane continues,” Detective Inspector Scott Beard, Auckland City Police said.

“Since receiving a missing person’s report around lunchtime yesterday, Police have been piecing together Grace’s last known movements with the last sighting being on Saturday night.

This image of Grace was taken at 7.15pm on Saturday night at Sky City in Auckland’s CBD. Photo/Supplied

This image of Grace was taken at 7.15pm on Saturday night at Sky City in Auckland’s CBD.

In the CCTV image Grace is seen wearing a black dress and white shoes, believed to be Converse shoes.

Police are aware of a number of reported sightings of Grace from members of the public.

At this stage, these are unconfirmed sightings and Police will assess these as part of our ongoing enquiry.

Police are keeping an open mind in this investigation and there is still work to be done.

CCTV footage has been crucial so far in locating Grace’s movements.

“Clearly this is a very stressful time for Grace’s family and the longer she remains missing the more our concern grows for her safety and wellbeing,” said Detective Beard.

“It’s important that anyone who recognises Grace from this photo or saw her on Saturday night contacts Police immediately on 09 302 6970.”