Staff at West Yorkshire Fire and Rescue Service says they were alerted to a fire at Ferrybridge C Power Station shortly before 2pm today.
Ten fire engines from the surrounding stations of Pontefract, Normanton, Featherstone, Castleford and Wakefield are at the scene.
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No one was understood to be injured in the incident and the reason for the engine failure is currently unknown.
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The union has been responsible for paying the costs of Mr Scargill's security since the 1970s when the police advised he needed protection.