Police have concerns for the safety of an Auckland teenager who hasn't been seen for four days.

Sativa Lane was last seen at Britomart station about 7.15am on Wednesday after telling her cousin she wasn't going to school and was heading south to see friends instead.

Police said a ticket was then bought for three zones and she was thought to have boarded a south-bound train.

"She has not been seen or heard from since, which her parents say is out of character. Sativa is Maori, 180cm, of slim build, brown hair and brown eyes. She was last seen wearing a Vanguard school jacket, grey hoody jumper, long black tights and black running shoes."

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Anyone with information is urged to call police on (09) 302 6400 or 021 191 2897.