Now that the Islamic State has officially claimed responsibility, I can say that this ideology is fundamentalist Islam.<p>I highly recommend this podcast by Sam Harris on this matter: <a href="https:&#x2F;&#x2F;soundcloud.com&#x2F;samharrisorg&#x2F;still-sleepwalking-01" rel="nofollow">https:&#x2F;&#x2F;soundcloud.com&#x2F;samharrisorg&#x2F;still-sleepwalking-01</a>