A gun was found in a car stopped by police officers on a Sheffield estate.
The car was pulled over on Westnall Road, Shiregreen, at 5.30pm on Monday.
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Details have only been released by South Yorkshire Police today.
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Four men in the car at the time were arrested.
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A South Yorkshire Police spokesman said: "Officers stopped a vehicle on Westnall Road. It contained four male occupants.
"During the subsequent search, a firearm was found in a bag. All four were arrested."