The teachers union of a small Massachusetts school district has gone on strike, and among their collective bargaining demands is expanded recess and lunch hours.

Administrators in Andover Public Schools announced that classes would be canceled Monday after the school district failed to negotiate a collective bargaining agreement with the Andover Education Association, which is demanding the school district increase teacher pay and expand recess and lunch.

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The district has offered a 14% pay raise for teachers over four years, but the union is demanding 18%, a number that the district says would force them to reinstate bus fees and cut extracurricular programs, such as sports and arts.

"If the School Committee accepted these wage proposals, our budget would be unsustainable and would result in layoffs," the district said in a statement over the weekend. "Accepting the AEA’s latest offer will have a meaningful negative impact on other parts of the school budget."

The union, for its part, says that the district is not engaging in a good faith negotiation.

"We're deeply disappointed, we feel that this is not a serious negotiation, that this was a tremendous waste of everybody's time," Matt Bach, the president of the Andover Education Association, said Sunday, according to CBS.

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Andover Public Schools is a relatively small district north of Boston. The district has roughly 5,500 students spread out over five elementary schools, three middle schools, and one high school. The district also has one preschool.

The strike in the Massachusetts school district is taking place as teachers in Portland, Oregon, enter a third consecutive week on strike. The union there has demanded increased pay and racial equity training as part of its negotiations.