EMMITSBURG, Md. (AP) — An elementary school principal in Emmitsburg is apologizing to parents for a letter asking students to bring knives to school.

The letter was an appeal for items that could be sent in care packages to U.S. troops in Afghanistan.

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Emmitsburg Elementary School Principal Kathryn Golightly told The Frederick News-Post on Wednesday that the school’s Parent Teacher Association compiled the list. She says she should have read it more carefully before approving it for distribution.

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Frederick County Public Schools policy prohibits students from having weapons of any kind on school property.

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