A Motorist was hit on the head after an object came through her offside window as she was driving along Edge Lane in Droylsden.
The incident happened at about 2.40 pm on 27th July 2013.
Witnesses reported youths seen on the grass verge at Bradford Garage throwing stones ,missiles and eggs at passing drivers. The woman who was hit needed hospital treatment, leaving her with a puncture wound.
Detective Constable Sue Holt appealed for anyone with information to call Police on 101, or Crimestoppers anonymously on 0800 555111.