ACT Policing is seeking the public's assistance to locate missing 13-year-old girl Imogen.

Police said Imogen had not been seen since 8.30pm on Friday and was last seen in Civic.

She is described as Caucasian in appearance, about 175cm tall with a slim build, fair complexion, mousy-brown hair and brown eyes.

Police said she was last seen wearing black tights with blue on the sides, black shoes and possibly a blue jumper.

Police and Imogen's family have concerns for her welfare, and are requesting the public's assistance to locate her.

Anyone who has seen Imogen, or who may have any information regarding her whereabouts, is urged to contact ACT Policing on 131 444 and quote reference number P2392583.

Information can be provided anonymously.

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