College basketball's national tournament begins in less than one week, and some sports analysts worry it might get violent.
A fan was arrested after storming the court to yell at Hawaii's head coach Thursday night.
A week ago, players and fans fought after Utah Valley University beat New Mexico State. In February, an Oklahoma State player shoved a fan in the stands.
Some experts say that could lead to changes.
"I would expect to see tighter security at March Madness. I think that some of these things that have happened during the regular season are warning signs," said ESPN analyst Bruce Pearl.
The NCAA says the safety of athletes, coaches, and fans are its top priority.