Police officers have released two images of a man and woman who they believe may have information about an incident in Wellington Road, Brackley.
Between 11am and midday on Saturday, August 27, a member of staff was threatened after challenging a suspected shoplifter outside a shop in Wellington Road.
During the incident a child in a pushchair has fallen into the road and the man, who was with a woman, picked the pushchair up as he continued to shout at the shop worker. The couple walked off and got into a black Vauxhall Astra car.
Officers believe the couple in the images may have information which could assist with their investigation and are appealing for them or anyone who may recognise them to get in touch.
Anyone with information is asked to call Northamptonshire Police on 101 or alternatively call Crimestoppers anonymously on 0800 555 111.