Hazing leads to expulsions. (Update: education news from schools, businesses, research and government agencies).

Thirty-one seniors at Glenbrook North High School just outside of Chicago who were suspended following a May 4 hazing incident, have been expelled, but will receive their diplomas, according to wire news reports.

Police charged the seniors for allegedly beating juniors and showering them with urine, excrement and other filth during the hazing. And police charged mothers of two students for allegedly supplying alcohol. A videotape showed many students drinking beer at an annual, unofficial "powder puff" game among students at a nearby forest preserve. Five players landed in the hospital, one with a broken ankle and another who needed 10 stitches in her head.

In a twist, two former Glenbrook North High School students have alleged in court papers that a teacher provided cooking grease to a student for a 2001 hazing and that a second teacher was aware of an even earlier hazing.

According to the Chicago Tribune, the allegations mark the first time teachers have been linked to any hazings involving students at the school. The teachers are not accused of any involvement in the May 4 brawl.

Lawyers for some of the seniors expelled for the 2003 hazing have complained that school officials knew about the annual ritual for years but did not do anything until this spring, after the event drew national attention because it was videotaped.

Dave Hales, superintendent of Northfield Township High School District 225, said there is "no credibility to any rumors that teachers or staff will be disciplined in any way as a result of allegations, past and present" having to do with the hazings.

Meanwhile, five juniors received nine-day suspensions after refusing to sign an agreement with school officials not to discuss the incident.