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At least 12 people were killed across Egypt on Friday, the health ministry said, in clashes between security forces and supporters of ousted president Mohamed Morsi.
Morsi's Muslim Brotherhood meanwhile said 25 people had been killed at one protest site alone, in Cairo's Ramses Square.
The health ministry said four people were killed in violence in the Suez Canal city of Ismailiya and another eight in northern Damietta.
Security sources told AFP that five protesters had been killed in clashes with security forces in Ismailiya.
And they said a police conscript was killed when gunmen attacked a checkpoint in the capital.
Medics also said two people were killed in the North Sinai town of El-Arish, including a policeman, and one protester in the canal city of Port Said.
The violence came as Islamists marched in several cities around Egypt in what they dubbed a "Friday of anger" to protest the killing of hundreds of Morsi loyalists following a security crackdown on Wednesday.
Protests were held in Cairo, in the northern city of Alexandria, in Beni Sueif and Fayyum south of Cairo, and in the Red Sea resort town of Hurghada.
The interior ministry said Thursday that it would take tough measures, including the use of live fire, if protesters attacked government buildings.