A woman was assaulted and members of the public verbally abused by a man who was walking along Rockingham Road and Gold Street in Kettering on Thursday, 12 November.
Between 12.30pm and 12.50pm the man shouted racial abuse and offensive comments to strangers and then pushed a woman in the arm, causing her to stumble back.
The offender is described as white, aged about 30 and he was wearing shorts, a coat and a hat.
Police would like to hear from anybody who witnessed the incident or who can help identify the offender.
Witnesses or anyone with information about this incident are asked to contact officers on 101 or Crimestoppers anonymously on 0800 555 111