A 15-year-old boy suffered a broken cheekbone after being assaulted in a park.
Between 4pm and 6pm on Tuesday, April 7, a boy was on Grange Park Recreation Ground in Alfreton when he was approached by a group of youngsters.
One of the offenders pushed the boy into a wall then punched him in the face.
The victim suffered a broken cheekbone and cuts and bruises.
Anyone with information should call Derbyshire police on 101 or Crimestoppers on 0800 555 111.