Police were called after reports of a teenage boy carrying a knife in Burton Latimer.
One arrest was made and an investigation has been launched by officers.
A spokesman for Northants Police said: “We were called to reports of a teenager carrying a knife in Station Road, Burton Latimer, at 8.20pm on Saturday night.
“We attended and a 14-year-old boy was arrested on suspicion of possession of a weapon.
“He has been released while investigations continue.”