So it can had be 3 things if it wasn't from any of Gaza terrorist group ( they didn't say Hamas) First, some Ilamic Brotherhood members from the Egypt branch instead of the Palestinan one. Secondly, a new negev-based terrorist group Third, a new sinai-based terorist group. And we can also imagine a lot of excentric possiblities, like sudaneses rebels or ruusian maffia... Really someone can think of any other real posibility than gaza-based terrorist group?
Roadside bomb kills five border officers in western Iraq (AP)
from the article: Netanyahu: Hamas responsible for rockets on Eilat; we will retaliate