Officers were called to King Street at around 3pm yesterday. An eyewitness reported seeing a police dog and a cordon at the scene. A police spokeswoman said: "We received reports of a male with a knife in King Street at 3.05pm yesterday. (Image: Norfolk Police)"Officers were deployed and following inquiries a boy was arrested on suspicion of affray and possession of a knife." He was taken to Wymondham Police Investigation Centre for questioning and released on bail until October 27.