Northamptonshire Police believe the two men seen in the footage may have information about an assault that also involved criminal damage.
The incident happened at about 1pm on Saturday, March 25 in the underpass from Thornhill to Briar Hill, when a 29-year-old victim was approached by two other men.
One of them grabbed his tablet computer and threw it to the ground, smashing the screen, and the other pushed him to the floor.
The offenders then made off in the direction of the Briar Hills Stores.
Anybody who recognises the men pictured or who has any information about the incident is asked to contact police on 101 or Crimestoppers anonymously on 0800 111 555.