Scuffles erupted on Friday between thousands of protesters in Alexandria, some of whom sided with President Mohamed Mursi while others opposed him.
At least two people were injured following an exchange of stone-hurling, Aswat Masriya correspondent reported.
Thousands of Mursi supporters stood in front of al-Qaed Ibrahim Mosque chanting in support of the president following the Friday prayer while hundreds of his opponents gathered at a park in front of the mosque chanting anti-Mursi slogans.
Mursi supporters chased his opponents into side streets, the correspondent added.
The biggest Freedom and Justice Party headquarters in Alexandria was torched as well, the correspondent said.