Authorities say four juveniles have been arrested in connection with a series of threats made against high schools across the Valley recently.
The threats started on Monday morning against five high schools in Phoenix, including Carl Hayden, Maryvale and Cesar Chavez.
The threats continued throughout the week and expanded to other high schools, including Betty Fairfax and Copper Canyon. The activity was enough to earn the attention of the Arizona Counter Terrorism Information Center.
No schools canceled class, though parents and students reported the threats did lead to decreased attendance.
The threats have been fueled by posts on various social media pages, but law enforcement officials say each case has found the allegations to not be credible.
A spokeswoman with the Maricopa County Attorney's Office said the threats appear to be unrelated to one another. Those arrested could face charges including hoax, a Class 4 felony, and interfering with an educational institution, a Class 6 felony.