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.
The man shouted racial abuse and offensive comments to strangers and then pushed a woman in the arm, causing her to stumble back, between 12.30pm and 12.50pm on Thursday, November 12.
The offender is described as white, aged about 30 and he wore 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 the incident is asked to contact officers on 101 or Crimestoppers anonymously on 0800 555111.