Supporters of the Muslim Brotherhood staged a number of marches from several mosques in Cairo and other cities on the first Friday after a new protest law curbing demonstrations was put into effect last Sunday.

In Cairo, demonstrators marched from mosques in Maadi, Helwan, and Nasr City, the Middle East News Agency (MENA) reported.

They also staged marches that took off from two mosques in Giza, MENA added.

Security forces in Alexandria fired teargas bombs to disperse protesters marching in Loran area to denounce a verdict sentencing female protesters to 11 years in prison.

The protesters fled to side streets to escape the teargas.

In New Damietta, police forces broke up a march for hundreds of pro-Brotherhood demonstrators after they clashed with residents near Saeedi Street.

Four people were injured with shotgun pellets in the clashes, a Freedom and Justice Party website reported.

Earlier this morning, army forces sealed off Cairo's Tahrir Square and intensified security measures at Rabaa al-Adaweya and Nahda squares in preparation for protests which the National Coalition for Supporting Legitimacy has called for.

The coalition, which backs former President Mohamed Mursi, had called for a million-man demonstration entitled "Justice is coming" on Friday to mark 100 days on the Abu Zaabal Prison incident in which 37 pro-Brotherhood prisoners were killed.

On Thursday, a Cairo University student was killed and 27 others were injured in clashes between pro-Brotherhood demonstrators and the police inside the university campus.

Earlier on Friday, police forces intensified security around the Qubba Palace parameters and placed barbed wires at its main gate.