Clashes between police and protesters erupted on Monday in central Cairo. There have been skirmishes near Tahrir Square, where protesters tried to break through to the Interior Ministry, the Voice of Russia reported.
In response, police used tear gas. Protesters pelted them with stones and Molotov cocktails, in a repetition of what unfolded a year ago, shouting anti-government slogans.
Police are trying to move demonstrators away from the Interior Ministry, resorting to additional law enforcement cordons.
Dozens of casualties have been reported.
Diverse political and social movements of Egypt on Monday called a rally in front of the ministry in memory of victims of the tragic events of late November 2011.
A year ago, for several days in succession, Mohammad Mahmoud street adjacent to Tahrir was the scene of unending riots, which resulted in about 40 people killed. At the time, the protesters accused the Republic's Supreme Council of the Armed Forces of usurping power in the country, and demanded its immediate transfer to civilian rule.
The events led to a change of government, and army promises not to infringe on the power of the people.