Clashes broke out between supporters and opponents of the deposed president Mohamed Morsi in the city of Damietta in the northeastern Delta since Wednesday afternoon.
Eyewitnesses say at least 60 were injured in the violent clashes. A statement from the ministry of health puts the number of injured at 33.
According to Al-Ahram Arabic news website, clashes erupted after locals attempted to stop a march of Mohamed Morsi's supporters from moving in front of Al-Bahr mosque.
Supporters of the deposed president reportedly fired birdshots at their opponents.
The Nile delta governorate also witnessed the torching of a tourism office reportedly owned by a Muslim Brotherhood member. The attack was carried by masked men.
Earlier on Wednesday, ten were injured in clashes between the rivals in the nile delta govenorate of Menoufiya.
Egypt has witnessed frequent clashes between the two rival sides after Morsi's popularly-backed removal by the military on 3 July as his supporters have held ongoing protests demanding his reinstatement.
Dozens were killed in similar clashes in several governorates since Morsi's ouster.
On Tuesday, an explosive device went off at a police station in the Nile Delta city of Mansoura, the capital of Daqahliya governorate, killing at least one conscript and injuring 19, marking a possible transformation in the type of violence used.
In a controversial move on Wednesday, Egypt's Defence Minister Abdel Fattah El-Sisi, the military commander behind Morsi's removal from power, called on Egyptians to gather en masse Friday to give the army a mandate to take action against "terrorism."