A suspect was arrested by armed police minutes after concerned members of the public reported seeing a person carrying a gun.
Officers were called at 12.49pm this afternoon (Sunday) to Cranbrook Street, Nottingham city centre.
Armed officers rushed to the scene and detained a suspect in nearby Lower Parliament Street a short time later.
A 17-year-old boy was arrested on suspicion of possessing an imitation firearm with intent to cause fear of violence.
He remains in police custody.
Superintendent Kathryn Craner, of Nottinghamshire Police, said: “We take reports of this nature extremely seriously and immediately dispatched armed police officers to the area.
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“This incident will understandably have caused considerable alarm to witnesses, but I hope they will have been reassured by the swift and overwhelming police response.
“I hope this incident serves as a warning to others about the potential consequences of carrying an imitation weapon in public.”
Anyone with additional information about this incident is asked to call 101 quoting incident 429 of 31 October 2021.