Police arrested 16 men in Birmingham yesterday following violent clashes between rival fans after the city's football derby.
Officers carried out early morning raids on 20 addresses across the city after violence as fans left a Birmingham City versus Aston Villa match on November 11.
The 16 men were arrested on suspicion of violent disorder, West Midlands Police said. About 40 police officers were injured during the trouble, which happened as people left St Andrew's Stadium in Birmingham and lasted more than an hour-and-a-half.
Shops, vehicles and other property were also damaged. Some people thought to have been involved in the disorder were identified as a result of CCTV images released by police.
Officers are appealing for help from the public to help trace six other men.
Detective Sergeant Neil Groutage said: "West Midlands Police continues to clamp down on the minority of football fans who spoil the enjoyment of the game for the majority of peaceful fans who visit stadiums and watch matches in other venues throughout the region.
"We will do everything we can to catch them and prosecute them.
"Anyone found guilty of such offences will face a banning order, meaning they will no longer be able to follow their team, home or away."
Anyone with information should contact Stechford police station on 0845 113 5000 or Crimestoppers on 0800 555 111.