PITTSBURGH, PA (CNN) -- Some fans of country crooner Kenny Chesney have earned a reputation for being too rowdy and messy!

His concert in Pittsburgh Saturday ended with several fights and numerous arrests. And the group left tons of smelly trash behind.

Parking lot attendants say there always seems to be a problem whenever Chesney comes to town. They say it gets so bad, they have a hard time finding police to work the event. ALCO Parking president Merrill Stabile says, "The Kenny Chesney crowd is the most difficult crowd for our employees to work with of any of the events of the year."

Extra police were brought in this time around. Still, KDKA reports 150 people were treated for medical problems.

Officials say it's only about 20 percent of the people causing the disturbance.

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