Suspected pepper spray was discovered by police during a raid at a property in Doncaster this morning.
Officers executed a search warrant at an address in Thorne and found 'suspected pepper spray in an unopened package'.
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It was part of the wider Operation Sceptre to crackdown on knife crime across the county.
A South Yorkshire Police spokesperson said: "While no knives were found, pepper spray is a prohibited weapon and is illegal in the UK."