An Israeli drone strike reportedly killed five suspected militants in the Sinai peninsula Friday, according to Egyptian security officials.
They said the Egyptian authorities cooperated with Israel on the attack, which also destroyed a rocket launcher.
The Israeli military said it was looking into the report, according to the Associated Press.
Meanwhile, the US and European Union called for a resolution to the "dangerous stalemate" in Egypt.
Naglaa Mahmoud, the wife of ousted Egyptian President Mohamed Morsi, made a surprise appearance at a protest in Cairo on Thursday.
"He is coming back, God willing," she told thousands of Morsi supporters assembled at Raba'a al Adawiya mosque in the Cairo suburb of Nasr City. The crowd responded with cries of “Returning! Returning!”
It’s the first time Mahmoud has been seen since July 3. Her husband is being held with his top aides in an undisclosed location by Egypt’s interim government. Mahmoud did not say where she had been staying since he was overthrown.
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"The Muslim Brotherhood are political animals,” Mohammed Aboul-Ghar, leader of the Egyptian Socialist Democratic party, told the Associated Press. "They are preparing for a comeback to power through ballot boxes. The way back is through winning support when bloodshed among its ranks turns the public against the Egyptian leadership."
While the government has said it plans to crack down on pro-Morsi protests, the Cabinet issued a statement this week implying that it would not remove demonstrators during Eid festivities marking the end of Ramadan, which started Thursday and continue through the weekend.
Tens of thousands of Morsi supporters marched through the capital on Friday, according to the Associated Press. Scattered clashes were reported and a few people injured, according to local press cited by the AP.
Here's more from the protesters as interviewed by Al Jazeera: