Story highlights Four schoolteachers are among six men arrested in Israel on charges of supporting ISIS

An elementary teacher in Hura sang songs praising ISIS to his students, police say

"We will not allow anyone to contaminate our children," Israeli education minister says

Jerusalem (CNN) Six men have been arrested on suspicion of supporting ISIS in Israel, following an investigation by Israeli security and counterterror forces.

The men were indicted on charges of supporting a terrorist organization, possessing and distributing advertising materials of an illegal group, and conspiracy, among other accusations, according to a written statement from police spokeswoman Luba Samri.

Among the six suspects: four schoolteachers, one of whom taught at an elementary school in Hura. According to police, the man took "every opportunity" to teach his young students about ISIS.

Police say the teacher would sing songs praising ISIS in class, express his support for the terrorist organization, and show students map drawings of the self-proclaimed Islamic State -- the group's preferred moniker, and also the way it refers to its wide swath of territory across Syria and Iraq.

He even posted support videos to YouTube, but later removed them. Police say he'd been "warned that it might interfere with his work as a teacher."

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