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FORT WORTH (CBSDFW.COM) – Concerned parents protested outside of Tidwell Middle School in Fort Worth on Friday after the Tarrant County District Attorney opted not to file charges against a student who penned an online book about killing classmates.

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Several parents and students already protested at the school last month after an eighth-grade boy wrote a graphic book online that detailed some gruesome killings, and even named specific classmates. They considered the boy’s work to be a violent threat, and wanted the writer to be removed from school.

But prosecutors on Wednesday said that the case is now complete because no crime was committed. Now, that student is back in class, leaving his peers and their parents to live in fear.

Parents protesting at the middle school on Friday want to know what steps the Northwest Independent School District is taking to make sure that the campus continues to be a safe learning environment. “My daughter’s left class and gone to the office. Texted me saying, ‘Dad, what do I do? He’s here,'” said parent Jason Ziemann. “My 12-year-old should not feel like that walking into a classroom.”

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Some parents have encouraged their children to leave class if they do not feel safe.

The school district on Friday refused to comment further, simply referring to previous statements stating that safety is a top priority.

“The environment just feels so much more different, and it feels like, at any moment, something bad will happen,” said seventh-grade student Jenae Zieman during last month’s protests. “It feels just horrible knowing that there’s a kid like that who actually wants to hurt people, and it’s just scary.”

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The father of the young writer added that his son has no intentions of harming any students. The child writes often, he said, and has been encouraged to continue expressing his creativity.