AMES, Iowa -- A day after a festival near the Iowa State University campus turned riotous, the school's president said he will shut down the yearly event unless he can be assured there will be no more violence.

"The question in my mind is, can that be achieved?" President Greg Geoffroy said Monday.

Geoffroy said he will decide the festival's fate by next week, after consulting with administrators, students, and business and community leaders.

More than 1,000 people vandalized cars, broke storefront windows and tore down street lights in the mayhem early Sunday.

Officers broke up the crowd with tear gas and arrested about 30 people on charges ranging from disorderly conduct to assaulting a police officer.

The student-organized Veishea celebration began in 1922. It has had disturbances before.