At least three people were killed in clashes between supporters of ousted president Mohamed Morsi and security forces on Friday.

Anti-government demonstrators staged protests throughout the country, in preparation for a wave of protests to mark the 25 January Revolution’s anniversary.

A male teenager was killed in clashes in Al-Haram Street in Giza, but officials could not identify whether the 18 year-old was a Morsi supporter participating in the protest or not, according to state-run newspaper Al-Ahram.

The Freedom and Justice Party (FJP), the Muslim Brotherhood’s outlawed political wing, confirmed on its official Facebook page the death of three protesters. Two of the deaths occurred in Giza and the third in the Matariya district in north Cairo.

In the last anniversary of the 25 January Revolution, Matariya saw the worst violence, as pro-Morsi protesters confronted local residents and riot police. WikiThawra, an independent database dedicated to the Egyptian revolution, listed 30 dead and 70 injured in the mentioned incident.

Since Morsi’s ouster in July 2013, protests and street clashes have resulted in the deaths of hundreds of protesters and scores of police personnel.

The pro-Brotherhood National Alliance to Support Legitimacy called for Friday protests under the title “Together We Revolt” to prepare for major protests on 25 January.

The alliance called on “all free popular forces” to unite behind “the banner of 25 January Revolution.”

The Ministry of Interior announced Friday that gunmen opened fire against a Central Security vehicle in Qaliubya, north of Cairo, and the shooting resulted in injuring a police officer and four conscripts.