A man used threatening language to a woman sat in a parked car before running off.
Police are appealing for witnesses to the incident which took place at about 2.30pm on Thursday (May 30).
A police spokesman said: “A 42-year-old woman, in a blue Ford Galaxy parked in the Dunelm Mill store car park in Northfield Avenue, Kettering, was approached by a man who used threatening language.
“He then ran off down Northfield Avenue in the direction of the town centre.”
The white man is between 6ft and 6ft 3in, aged between 30 and 40, of stocky build, with short ginger hair and wore jeans.
Any witnesses to this incident can call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.