I should have provided some more details....

The 19 were arraigned Monday on felony charges of placing a false bomb after sneaking into the school and planting dozens of alarm clocks throughout the building - set to ring in unison during the last day of classes - triggering a bomb scare June 10.

The 19 teens could have been charged with more serious crimes, such as third-degree burglary, which has a maximum penalty of seven years in prison.... The false-bomb-placing charge carries a maximum four-year prison penalty.

Police could not confirm the incident was a harmless prank until the next day, when the situation was discussed fully with school administrators and the student body.