UPDATE: Libby has been found safe and well.
Mandurah Police are seeking information regarding the whereabouts of missing girl Libby Skye Shannon, who was last seen at the Cockburn Train Station on Sunday February 28.
The 15-year-old has not had contact with her family since Thursday February 18, and was reported missing the following week.
Concerns are held for her welfare as she has not been away from family for this period of time before.
Libby is described as fair skinned, of medium build, with dark hair and it's believed she may be in the Mandurah to Fremantle area.
Anyone who sees Libby is asked to call Police on 131 444.
Anyone who has heard from Libby, or who has information regarding Libby’s movements between Thursday, February 18 and now is asked to call Crime Stoppers on 1800 333 000 or report the information online at www.crimestopperswa.com.au.