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TAMAQUA, Pa. (CBS/AP) — Parents are taking a Pennsylvania school district to court to block the district from allowing teachers to carry guns in school.

A lawsuit filed Thursday says that Tamaqua Area School Board members “endangered their community” when they approved a policy to arm teachers and other school employees. The suit says the policy violates state law.

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The plaintiffs include parents and grandparents of students. They plan to discuss the suit at a news conference Friday.

The teachers union has already sued to overturn the policy.

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The school district has said that arming teachers and other employees will help “preserve a safe school environment for students and staff.” The policy, approved in September, says teachers and other employees can carry district-issued guns after firearms training. It also establishes guidelines for the use of force.

(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)