This was likely boko haram. The name means “books are unclean”. There idea us that only the Koran should be read and reading anything else is unislamic. They are about the worst of the worst.
Kinda makes you wonder how we can lose to these people. They don't like education, they don't like technology, they can't contribute to civilization, yet they keep thriving. Only our unwillingness to really engage them keeps them around, because we are too nice.