The bomb squad have been called in after an unexploded World War Two shell was discovered in a canal.
Police have sealed off Old Mill Lane and Wakefield Road close to Barnsley town centre.
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Emergency services were called to the scene at 9.45am this morning following a report of the sighting in the canal at the back of Asda.
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The explosive ordnance disposal unit has been called to the scene to examine the shell.
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The roads are expected to remain closed for some time.