CHICAGO (CBS) — Maine Township School District 207 on Tuesday confirmed that subpoenas have been issued by a Cook County grand jury for records from administrators as part of an investigation into allegations of hazing.

The subpoenas were issued shortly after the state’s attorney’s office announced a “top-to-bottom” review of allegations at Maine West High School.

The district says in addition to hiring of an independent investigator later this month to address this situation, they will continue to cooperate fully with all agencies conducting their own investigations.

Last month, the District 207 school board voted to fire the school’s soccer coach, Michael Divincenzo, who has been accused of allowing criminal hazing activities, including the sodomizing of players.

School Board President Sean Sullivan said board members believed that Divincenzo failed to “adequately prevent, recognize, report and punish student hazing.”

Divincenzo has been suspended without pay, and has the right to appeal his dismissal. Should he choose to do so, the appeal to the Illinois State Board of Education could take a year to complete.

At least four boys have said they were sodomized by other players during hazing rituals at the school over the years, and that Divencenzo and other coaches were present during some of the hazing.