A 21-year-old man was assaulted at around 8.30am on Tuesday, 18 August, in the Earlstree Industrial Estate, Corby.
The man was walking to work when he was approached by another man who punched him.
Police are appealing for witnesses to the incident which happened near to the Golden Wonder factory. They would particularly like to speak to an elderly lady who witnessed the incident.
A 35-year-old man has been arrested in connection with the incident and released on bail pending further enquiries.
Witnesses or anyone with information about this incident are asked to call police on 101 or Crimestoppers anonymously on 0800 555 111