Police are trying to trace a teenage boy after a woman was indecently assaulted in the Mastrick area of Aberdeen.The attack happened in Mastrick Drive at about 19:05 on Saturday.The youth was described as being 14-15 years old, about 5ft, of slight build. He was wearing a dark hooded top, dark tracksuit bottoms and white trainers.A spokesman for Grampian Police urged anyone with information to contact the force.