Eight people were injured in Alexandria while one was wounded in Cairo during the protests, Mohamed Sultan, head of Egypt's Ambulance Authority, told Xinhua.
"We deployed 35 ambulances in riotous governorates; 15 in Cairo 's Tahrir Square, 10 in Alexandria and 10 in Gharbiya's city of Tanta," Sultan added.
In Cairo, thousands of protesters rallied outside the Supreme Courthouse, protesting against the prosecutor-general's recent decision to arrest five anti-government activists over inciting violent clashes outside the Muslim Brotherhood headquarters on March 22, which left over 200 injured.
Some of the protesters demanded sacking Prosecutor-General Talaat Ibrahim Abdullah, especially after the Court of Appeal on Wednesday overturned President Mohamed Morsi's decree that appointed him in November 2012.
Mahmoud al-Attar, 47, told Xinhua "We're here to tell everyone that we are dissatisfied with the performance of the president and his Muslim Brotherhood supporters, as our situation is getting worse since they have come to power."
Another protester, retired army officer Arafa Khater, said that Morsi should respect the judiciary that ruled the unconstitutionality of the current prosecutor-general.
"We do not care who will be the prosecutor-general, we just want the judiciary, the armed forces and the police to be respected," he said.