South Yorkshire Police has already referred itself to the Police Complaints Commission over its involvement in the "Battle of Orgreave".
But they say any inquiry would take some time because of how long ago the events took place.
Fighting broke out between miners and police at Orgreave Colliery during the miners' strike in 1984.
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Health experts in Leeds are teaming up with enforcement agencies to raise awareness of the potentially deadly risk posed by 'legal highs'.
Hull and East Yorkshire Hospitals NHS Trust is hoping its latest recruitment campaign will also boost staff morale.
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