I expected this, but not so soon. "Egyptian analyst: Can't rule out that Mossad was involved in attack," from [1] Ynet News, with thanks to the Constantinopolitan Irredentist:

Retired General Salah al-Din Salim, an Egyptian researcher at the Strategic Studies Institute in Cairo, said that it could not be ruled out that the Israeli Mossad was involved in the terror attack in Dahab.

"The Mossad's ability to penetrate the Bedouins in Sinai is known," Salim said in an interview with al-Jazeera.