The Three mobile phone store on Market Street was robbed this afternoon, and a quantity of stock was stolen.
Police were called to the scene at 1.02pm, and added that no one was reported injured.
Officers are currently making enquiries in the area.
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A spokesperson for Hampshire Constabulary said: “We understand that there would have been other members of the public in the area who witnessed this incident, including individuals potentially filming this on their mobile phones.
“Did you see this incident? Did you see the men involved prior to the robbery, or did you see where they went after the incident?
“Have you captured any footage of this incident at all? If so, please do not circulate this online and instead contact police immediately.”
Anyone with information is asked to contact police on 101, quoting 44250259360 or via the Hampshire Constabulary website.
Alternatively, you can contact the independent charity Crimestoppers 100% anonymously on 0800 555 111, or via their anonymous online form.
