The three year anniversary of the start of the Egyptian uprising, which overthrew Hosni Mubarak, has seen demonstrations by both supporters and opponents of the current government, backed by the military.
Police attempted to break up the opposition protests, and clashes left at least 29 demonstrators dead.
"The only thing allowed is Sisi revolutionaries," one of the activists, blogger Wael Khalil, told the Associated Press news agency.
"This was supposed to be a day to mark the revolution... I don't get it. Do they think that there will be a working democracy this way?"