READ UPDATE: BREAKING: Details Released On N.J. Fifth-Graders' Alleged Threat To 'Damage' High School Five fifth-grade students were arrested after they planned to set off explosives at a N.J. high school, police said.

Police said someone else may have helped the students come up with the plan to terrorize the school, according to News 12. The children have been released into the custody of their parents, but are suspended from school, according to WNBC-TV.

The students, all fifth-graders, brought a device to School 11 and were going to use it during a field trip to Clifton High School, Detective Sgt. Robert Bracken said in an nj.com report. "It was not a prank," Bracken told NJ Advance Media. "They had a legitimate plan."