Classes are canceled for thousands of students in far northern Illinois after teachers at Zion-Benton Township High School decided to go on strike.
The strike began after a mediation session called in hopes of reaching a tentative contract agreement broke off early Thursday.
The Zion-Benton Federation of Teachers represents nearly 300 employees in the 2,800-student district about 45 miles north of Chicago.
Illinois Federation of Teachers Field Service Director Michelle Standridge says sticking points in the negotiations include health insurance and pay.
District attorney Anthony Ficarelli calls the strike "unfortunate" and says he doesn't think it is necessary at this point.