Absolutely. This doesn't have to be Abdul and Mohammed either in order for this to be ME terrorism.
My read. Hired mercenaries. That's why they are so hard to profile. The shooters themselve don't really have an agenda.
Or at least someone that shares the same hatred. Enough so that they side with the ME, even if temporarily. The enemy of my enemy is my friend (at lease for now)?
Or Cheychens perhaps...