Clashes broke out on Friday between Alexandria's Sidi Beshr residents and Muslim Brotherhood supporters after the residents refused to let the Brotherhood's allies march through their area.
The two sides hurled stones at each other.
Supporters of the former president and the Brotherhood earlier gathered at various areas in Alexandria and staged marches.
They chanted, "Down with the rule of the military" and "Leave, Sisi ... Mursi is my president".
Scores of the Brotherhood's supporters marched in Agami area, holding banners of the Rabaa symbol as well as pictures of political prisoners and people killed in clashes.
They also distributed leaflets carrying the word "Void" to express their rejection of what they called the military coup and demand the return of former President Mohamed Mursi to power.
On the other hand, dozens of Defence Minister Abdel Fattah al-Sisi's supporters marched earlier today to urge him to nominate himself for presidency.
They carried banners saying "The army and the people stand united" and "Sisi is my president".
Alexandria's security headquarters stepped up security all over the city in anticipation of acts of violence.
Security forces were deployed at al-Qaed Ibrahim and Sidi Beshr mosques while police vehicles patrolled areas where Brotherhood supporters planned to gather.