OMAHA, Neb. -- Fed up with fans interrupting the College World Series games by running onto the field, officials are warning of full prosecution for anyone who pulls such a stunt.

Omaha city prosecutor David Smalheiser said Wednesday he didn't know how many people have been ticketed in recent years. According to media reports, six people were cited last year alone, including a 17-year-old girl who patted the backsides of two players while security personnel chased her.

Smalheiser said trespassers face six months in jail and a $500 fine.

Dennis Poppe of the NCAA said "idiots" who run onto the field are spoiling what for most players is a once-in-a-lifetime opportunity to play for a national championship.