At least 38 people have been killed and dozens more hurt in clashes between Egyptian security forces and supporters of ousted President Mohamed Mursi.
Violence flared as Egypt marked 40 years since its attack on Israel in the 1973 war.
In several cities, Mursi’s Muslim Brotherhood used the anniversary to protest against the military which deposed the Islamist leader in July. Most deaths were in Cairo where 200 Brotherhood members were reportedly arrested.
The Muslim Brotherhood accuses the army of staging a coup and sabotaging democracy by removing Egypt’s first freely-elected president. But those backing the army believe Mursi was trying to acquire sweeping powers and mismanaging the economy – claims he denies.
Security around Tahrir Square in the capital was tightened as supporters of the military gathered for the official celebrations.
While the Brotherhood wants Mursi back in power, many gathered in the square would like to see army chief General al-Sisi as president.
On what should have been a day of unity, Egypt remains divided.