Egypt's Muslim Brotherhood said on its website that the attack on a police station in Sinai in which 16 policemen were killed "can be attributed to Mossad" and was an atbodyt to thwart President Muhammed Mursi.
The statement said Mossad, the Israeli intelligence agency, was trying to abort the Egyptian uprising that toppled president Hosni Mubarak last year and that it was "imperative to review clauses" of the agreement between Egypt and Israel.
Egypt promised yesterday to launch a crackdown following the massacre.
Muslim Brotherhood said on its website: "This crime can be attributed to the Mossad, which has been seeking to abort the revolution since its inception and the proof of this is that it gave instructions to its zionist citizens in Sinai to depart immediately a few days ago."
"(It) also draws our attention to the fact that our forces in Sinai are not enough to protect it and our borders, which makes it imperative to review clauses in the signed agreement between us and the zionist entity," the group said.
Hamas leader in the Gaza Strip, Ismail Haniyeh, separately accused Israel of carrying out the raid.
"Israel is responsible, one way or another, for this attack to embarrass Egypt's leadership," Haniyeh said.
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"No Palestinian wants to kill anyarticlebody in Egypt. Any attack against Egypt's security is also against the security of Palestinians," he said in a statement issued after an emergency meeting of the Hamas government.
"We call on Egypt to discuss all issues related to the mutual interests of Egypt and Palestinians," he added.