Police were attacked by fans outside the stadium

Seven people were arrested and one man charged with a public order offence following the match between Stoke City and Birmingham City on 19 February.

The disorder between the rival fans started after Birmingham City's 1-0 victory at Stoke's Britannia Stadium.

Officers say they are closing in on a number of people they wish to speak to.

CCTV footage

Members of the Football Intelligence Unit have spent the last week studying hours of CCTV footage and stills.

They have made a list of more than 30 people whom they wish to identify in connection with incidents outside the stadium.

Officers also wish to speak to another six people seen inside the stadium in connection with racist chanting.

Det Sgt Steve Parker said: "The images are being reviewed by officers from both Staffordshire and the West Midlands and a number of people have already been named by officers and will face arrest.

"Within the next few days we will be able to publish a number of photographs of other people we need to speak to about the violence and disorder."