British Police are trying to identify a man responsible for knocking a 16-year-old girl unconscious around 12:36 PM (GMT) last week on High Street in Plaistow, London (as seen in the CCTV footage). Anyone with information about this incident should contact the Newham Violent Crime Unit (020-8217-5890) or Crimestoppers (0800-555-111) with the reference number S/194/12.

Editor's Note: This video contains violent footage that may not be suitable for minors.