The FA Cup match between West Bromwich Albion and Wolverhampton Wanderers at The Hawthorns on Sunday was temporarily suspended after supporters entered the pitch following disorder in the stands.
Violence broke out among supporters after Wolves forward Mateus Cunha put the visitors from the Premier League 2-0 up. Police then entered the crowd, causing the referee to prevent the match from restarting.
A message on the screens inside the ground read: "Please return to your seats. Entering the field of play is a criminal offence."
Wolves defender Craig Dawson attempted to calm supporters before the players and staff from both teams went down the tunnel as police attempted to resolve the situation.