A ministry of health official has said that 17 people were injured nationwide on Tuesday, as various demonstrations took place to commemorate the anniversary of violent clashes in 2011.
The injuries are mostly bruises and breathing difficulties, the official said.
Several thousand protesters opposed to both the military and the Muslim Brotherhood gathered on Tuesday in Cairo's Tahrir Square for the second anniversary of the Mohamed Mahmoud Street clashes, which pitted anti-military protesters against security forces in November 2011. The clashes lasted for six days and left 47 dead and at least 3,000 injured.
Four people were injured in Tahrir Square and near the interior ministry, located in the vicinity. One of the injured is a police officer.
Other injuries were recorded in protests that took place nationwide by supporters of ousted president Mohamed Morsi.
In the Daqahliya governorate, north-east of Cairo, eight people were injured at protests at the local campus of Al-Azhar University.
In Damietta, four people were also wounded, while one person was wounded in Alexandria.