Regina police are asking the public for help in locating a missing 15-year-old girl.Tristen Sage Bird was last seen on Tuesday around 1:45 p.m. at her home on the 2900 block of 26th Avenue.Bird is described as an aboriginal girl, five feet two inches tall, around 120 pounds with a thin build.She has shoulder-length black hair and brown eyes and was last seen wearing dark blue jeans, a white tank top and a black and white plaid shirt.Anyone with information is asked to contact the Regina Police Service at 306-777-6500 or Crime Stoppers at 1-800-222-8477.