Where's missing 15-year-old Mia? Police 'following up reported sightings'

Police are following up reported sightings of missing 15-year-old Auckland girl Mia Stewart.

This morning police confirmed to 1 NEWS they were "investigating a missing person's report relating to Mia".

Detective Senior Sergent Nadene Richmond said a team based in Orewa were working on finding Mia.

"Police are working through enquiries at this stage and we are following up reported sightings of Mia," Ms Richmond said.

Where is missing Mia?

Late yesterday, Mia's mother Tracey Stewart posted about being "absolutely sick with worry" on Facebook.

Mia was last seen on Friday December 14 around the North Shore and Hibiscus Coast area.

Mother Tracey said the teenager's phone hadn't been used and she hasn't been active online since early Saturday. 

"If anybody knows anything or has seen her at all this weekend please contact ..the police."

She added that Mia had been battling anxiety and was with people she didn't know very well on the day she went missing.

Mia Stewart Source: Facebook

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