Why muslim terrorists kill other muslim terrorists?

Now Islamic State is killing military of Iran. At least they are not doing it in Europe or America. It seems to be a long war between the 2 branches of muslim terrorism.

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Mugin16 · 46-50, M

What do you mean with "now"? Sunni extremists like Al Qaeda and the Islamic State have been killing Shiites like the Iranians for a long time.