Police are appealing for public assistance to help locate missing person Brian.
The 18-year-old was last seen near Barmah Drive West, Wantirna about 12pm on 6 September.
Investigators have been told Brian was last seen on a silver mountain bike.
Police and family have concerns for Brian's welfare.
Investigators have released an image of Brian in the hope that someone can provide information on Brian's current whereabouts.
Anyone with information is urged to contact Knox Police Station on 9881 7000.
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