Officers are on scene for an investigation.
Police said around 3:40 p.m. that they received reports of a male with a firearm in the area of Swindale Drive and Grant Way, west of Derry.
Shortly after, police reported that the male in question was located and confined to a residence.
Residents can expect a continued police presence in the area.
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While there is little risk to public safety, residents are advised to avoid the area for now.