A man was pushed to the ground, punched and kicked by three men in Wellingborough.
The assault happened shortly before 6pm yesterday (Wednesday) in Abbey Road.
The victim was walking along the road when he heard one of the men shout something at him.
He ignored the comments and continued walking.
A few seconds later the group approached him, pushed him to the ground and assaulted him, causing bruising and a swollen lip.
The offenders got into a car and drove off after they were disturbed by a passing vehicle.
The suspects are described as black men, wearing black hoodies.
Anyone with information should contact police on 101 or Crimestoppers anonymously on 0800 555111.