West Bromwich Albion fans have raided the Wolves training ground.
The Birmingham Mail reports police have launched an investigation after graffiti was daubed across a wall at the Wolverhampton Wanderers training ground.
West Midlands Police are treating the incident as criminal damage and appealing for helping tracking down the offender who wrote: "WBA, Boing Boing."
It relates to a well-known Albion chant.
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