Police are appealing for witnesses to an altercation which took place in Kettering town centre on Saturday afternoon (May 31).
A man and two women were in the Newlands Centre when another man started shouting at them. As they left the shopping centre, the man followed them into Newland Street and a nearby shop, where he pushed the other man in the chest.
The incident happened between 4.50pm and 5.05pm and officers want to speak to anyone who may have seen what happened, in particular the man who intervened and removed the offender from the shop.
Witnesses or anyone with information are asked to contact Northamptonshire Police on 101. Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.