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A police spokesperson said they want to hear from anyone who may have seen Ngaire Ginders.
"She was last seen on 29 December in Christchurch and is described as 160cm tall.
"Police have concerns for her wellbeing and ask that anyone who may have seen her get in contact on 105 quoting file number 210109/2083."
Brianna, 14, was last seen at her home on January 8 and is believed to be in the Christchurch area.
She went missing for two weeks earlier this month before being located safe and well.