Egyptian police fired teargas at protesters supporting deposed president Mohamed Morsi who gathered east of the Mediterranean city of Alexandria on Monday afternoon, according to Ahram's Arabic news website.
The Muslim Brotherhood, from which Morsi hails, has urged its followers to gather on Monday to break their fast together on the eve of the Muslim feast of Eid Al-Adha.
Earlier in the day, supporters attempted to block the seafront road near the iconic Stanley Bridge in Alexandria, before clashing with security forces.
Three were arrested in the melee.
The Brotherhood has repeatedly called for street protests since the former Islamist president's ouster, which they view as a "coup."
Last week, 57 - predominantly Brotherhood supporters - were killed in clashes with pro-military protesters and security forces on the anniversary of Egypt's 1973 war victory against Israel.
Egypt has been gripped by political turmoil since the army overthrew former president Morsi on 3 July following massive street protests against his divisive one-year rule. Hundreds have been killed in deadly political violence since then.