A campaigning group, The Orgreave Truth and Justice Campaign, has been set up and they are demanding a public inquiry into the actions of the police at Orgreave Colliery during the miners strike in 1984.
South Yorkshire Police has already referred itself to the Police Complaints Commission over its involvement.
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Two former pupils of murdered teacher Ann Maguire have cycled 300 miles to raise money for a charity set up in her memory.
A memorial stone will be unveiled today at the spot where an explosion killed 27 miners at Maltby colliery in 1923.
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