At least 70 people were injured in Cairo when unidentified thugs attacked Coptic protesters, a security source said Sunday.
The Coptic demonstrators were staging a sit-in in front of the State Radio and Television building to demand greater rights and equality against what they believe are injustices against their minority faith when they came under attack, DPA reported.
Dozens of plainclothed men threw Molotov cocktails at the protesters, who responded by throwing stones back at the attackers.
Police and army forces arrested some of the attackers.
Violence between Muslims and Christians, once sporadic, has become a recurrent problem in recent months.
The clashes come amid heightened tension in Cairo after 15 Muslims and Christians were killed and over 230 people injured in a severe clash between the two groups last week.
A church and three apartment buildings were set ablaze in the incident.