Video: Video: Wolverhampton Wanderers fans urinate on West Bromwich Albion pitch

West Bromwich Albion have launched an investigation after Wolverhampton Wanderers fans filmed themselves urinating on the pitch following the conclusion of yesterday's Black Country derby.

The two-minute YouTube video, called 'West Brom v Wolves 2011: P***ing On Your Pitch', shows two fans running onto the Hawthorns' turf in daylight.

West Brom triumphed over visiting Wolves 2-0 courtesy of goals from Chris Brunt and Peter Odemwingie.

Watch a video of the incident below: Warning, explicit content.