If this has anything to do with a group called "ISIS", then the acronym stands for "International Sadistic Idiots Syndicate", and they have more interest in brainwashing and using technology for their own purposes than they have in an age-old struggle based loosely upon theological differences.

Truly, it takes people who are unhinged to engage in acts such as this.   And, it is predictable that the person identified as the perpetrator will be shot when they are found.   That's the pattern.