CCTV released over Huddersfield v Millwall violence
Detectives have released images of four people they want to trace in connection with violence before a football match between Huddersfield Town and Millwall.
More than 50 people were involved in fighting on Wakefield Road in the Waterloo area of Huddersfield at about 1900 BST on 16 April.
Police said 35 people had been arrested and 24 of those had been charged with a range of offences.
Officers now want to trace three men and a woman over the disturbance.
Insp Jim Griffiths said: "Ever since this incident took place, we have been actively pursuing those responsible and will not stop until we are satisfied that every offender has been dealt with.
"We simply want to know who these people in the photographs are. If you recognise them, please let us know."