Security forces dispersed dozens of protesters chanting against the government in the Ain Shams Cairo neighbourhood of Alf Maskan, according to state-media reports.
Marches also took place in several neighbourhoods across Cairo, and outside of Cairo in Qaliubiya. There have been unconfirmed reports of injuries and arrests.
Earlier this week, the Anti-Coup Alliance, which is composed of the Muslim Brotherhood and other groups that support ousted president Mohamed Morsi, announced a week of protests entitled “our strength is in our unity”.
The Muslim Brotherhood released a statement on its official website on Thursday calling for “unity in revolutionary action”, in remembrance of the third anniversary of the Mohamed Mahmoud clashes, in which security forces killed dozens of protesters.
Tens of protesters were arrested on Wednesday during the Mohamed Mahmoud anniversary, while police arrested Mohamed Ali Beshr, a leading member of the Anti-Coup Alliance on Thursday.
The alliance rejects Egypt’s current government and considers its rise to power to have been a coup. The group has repeatedly condemned violence.
Small-scale demonstrations have been taking place on an almost weekly basis since 14 August 2013, when security forces dispersed and killed hundreds of people protesting Morsi’s ouster.