A crackdown on sit-in protest camps by Morsi's supporters and subsequent violence left at least 1,000 people dead.
Brotherhood supporters have since been staging near daily protests to demand Morsi's reinstatement.
Their numbers have greatly dwindled in recent weeks but they have been energetically mobilizing for Sunday's rallies, claiming that they want to celebrate the war's anniversary while denouncing the military leadership that toppled Morsi, Egypt's first freely elected president.
The Brotherhood claims that its protests are peaceful, but there have over the past three months been cases when Morsi's supporters have carried and used firearms, clubs or firebombs.
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