Police are at the scene of an incident in Star Road in Peterborough this afternoon.
Officers were called at 3.55pm to reports of a man with a knife in Star Road.
The man got in a van and left the scene before officers could arrive.
Police are talking to witnesses at the scene and looking at CCTV to try and get a description of the man and the van.
The initial description of the man is that he is of large build wearing a white top.
Anyone with information should call police on 101.