Hundreds of supporters of ousted president Mohamed Morsi clashed late Monday afternoon with anti-Morsi protesters who have been holding a sit-in in Tahrir Square.
Mohamed Sultan, the head of Egypt's Emergency Medical Services, announced that 21 people were injured in the clashes.
Most of the injuries were caused by gunshots.
A doctor at the Mounira Hospital, a public hospital near Tahrir, confirmed to ONTV that the hospital received one fatality.