Seventeen people have so far been killed in Egypt as the country is rocked by nationwide protests against the violent crackdown on supporters of the ousted president, Mohamed Morsi.Four people were killed and many others wounded in clashes between Egyptian security forces and supporters of Morsi in a square in central Cairo. One Egyptian policeman was killed and three others injured in an armed attack on a military checkpoint in the capital. Demonstrators took to the streets across Cairo and marched on May 15 Bridge, in Zamalek neighborhood, after bypassing roadblocks. Clashes erupted between supporters of Morsi and security forces in the northern city of al-Mansoura, while eight protesters were killed in city of Damietta. In the Suez Canal city of Ismailia, Egyptian security forces killed four pro-Morsi protesters. Clashes were also reported in the Nile Delta city of Tanta. Protests are being held after Friday prayers in Egypt’s second largest city, Alexandria. Egypt’s Muslim Brotherhood has called massive demonstrations across the country on “the Friday of anger” to denounce the massacre of pro-Morsi protesters on Wednesday. The deadly police crackdown on Rabaa and Nahda protest camps left at least 640 people dead and injured over 4,000 others. The violence drew international criticism and triggered protest rallies in several countries. Tension has intensified in Egypt since July 3, when army chief Abdel Fattah al-Sisi removed Morsi from office, suspended the constitution and dissolved the parliament. The army also declared the head of the Supreme Constitutional Court, Adly Mansour, as interim president. Egypt is currently locked down under a month-long curfew and the police have been authorized to use live ammunitions in case of attacks against state buildings.