Fourteen people on Saturday evening were injured in clashes between protesters at the presidential palace in Cairo and unknown assailants, head of the Egyptian Ambulance Organization told al-Jazeera channel.
Media reports said that shots were heard in front of the palace.
Several tents of protesters at the palace were torched, al-Jazeera channel reported.
Scores of protesters were injured after unknown assailants had attacked them, al-Masry al-Youm gate reported.
The assailants shot at the protesters and set the tents on fire using petrol bombs.