December 3, 2015 12:09 PM EST

Five elementary-school students in New Jersey were arrested after police learned of a plot to bomb the assembly of a high school.

Police arrested the students of Clifton Elementary School #11, ages 10 and 11, after teachers found written plans about a potential attack Clifton High School during an assembly.

“It was not a prank,” Clifton police spokesperson Robert Bracken told NJ Advance Media. “They had a legitimate plan.” Authorities even discovered a device for the attack, though it did not contain explosives, only cinnamon and vinegar.

The children were released to their parents after police questioning and have been suspended from school.

“They didn’t have the right equipment, but the intent was there,” Bracken told the Clifton Journal. “This is very disturbing.”


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