Disgraceful scenes of crowd disorder marred the Black Country derby and halted play for 38 minutes as Wolves beat West Brom in the FA Cup at the Hawthorns.
Fighting erupted close to the area in the stands reserved for the players' families, while missiles were also thrown by both sets of supporters following the visitors' second goal.
In the first match between the two sides in front of fans since 2012, Matheus Cunha's 78th-minute effort sealed the fourth round victory for Wolves, who had taken a first-half lead through Pedro Neto.
But the tension in the stands that had been simmering from before kick-off spilled over.