Ministers understand concern over Orgreave inquiry says PM
Officers attended the British Steel Corporation (BSC) coking plant in Orgreave, where pickets wanted to stop lorry loads of coke leaving for the steelworks.
The strike lasted a year in total but the clash in June is considered the most violent day of protest. Mounted police were sent in to break up the picket, as well as officers in riot gear.
Fifty people were injured but when the cases came to court, all were abandoned after evidence provided by police was deemed unreliable.