A man was punched in the head in a Kettering supermarket.
The assault took place in the Co-op in London Road, Kettering, at about 2pm on Thursday, July 10.
A police spokesman said: “A man got out what was believed to be a silver Vauxhall Vectra estate and went into the store, punched another man in the head and then left in the same car.”
The attacker is described as white, in his late 20s with dark hair, and wore a short maroon T-shirt and cream three-quarter length shorts.
Any witnesses to the attack are asked to call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.