The National Alliance to Support Legitimacy, an Islamist coalition in support of the ousted president Mohamed Morsi, announced on Friday the beginning of a new sit-in in Al-Alf Maskan area in Cairo's Heliopolis district.

The new sit-in is the third held in Cairo in addition to that held by thousands at Nasr City’s Rabaa Al-Adawiya Mosque and at Al-Nahda Square in Giza.

Several marches were staged across Cairo on Friday. One march headed from Rabaa Al-Adawiya Mosque to the city’s security directorate and another from Ramsis in downtown Cairo to the main sit-in at Rabaa Al-Adawiya.

Another march headed to the Media Production City in the 6 of October, a satellite city on the outskirts of Cairo, where it clashed with police after security threw teargas in an attempt to disperse the crowds.

Meanwhile, three rallies are to be launched in Cairo Friday night. The pro-Morsi demonstrators plan to march to the police's National Security headquarters in Nasr City, the defence ministry in the Abbasiya neighbourhood and the Republican Guard headquarters in the Heliopolis district, the Muslim Brotherhood's Freedom and Justice Party said via Facebook.

Hundreds of pro-Morsi protesters marched to the headquarters of the military intelligence building in Nasr City on Tuesday. The protest, however, passed peacefully.

In a statement on Monday, the military had urged protesters not to go near military establishments and specifically not to approach the military intelligence building, saying that such actions could put protesters at risk.

At least 50 pro-Morsi protesters were killed at a Republican Guard headquarters demonstration on 8 July.