Who is responsible for the terrorist attacks near Eilat?

Yossi Gurvitz at +972 posits that the attackers came not from Gaza, but from Sinai. And I think he makes a pretty convincing case. Gurvitz however doesn't stop there and raises the question of whether Bibi and Barak intentionally deceived the Israeli public. But considering their restraint - Israel didn't launch a ground offensive into Gaza and has apparently accepted a cease fire - might the better explanation be that they just got it wrong? I'm willing to believe the worst about Bibi, but the logic of a pretext would seem to suggest a more aggressive response, not a cease fire.