A 16-year-old girl was assaulted in Daventry during an incident on Friday.
She was talking to friends in Chantelle Court between 9.30pm and 9.45pm when she was approached by a woman who asked the group to keep the noise down.
The woman slapped her in the face with the 16-year-old slapping her back. The woman then pushed the girl to the ground and punched her in the face four or five times.
Police are looking to speak to the woman who is described as white, around 18-19, 5ft 6ins tall with a skinny build. She had dark-coloured hair, worn with a fringe and was wearing black leggings.
Anyone with information about this incident should call police on 101 or Crimestoppers anonymously on 0800 555 111.