Clashes have erupted in Cairo's Tahrir Square as supporters and opponents of Egyptian president Mohamed Morsi tried to wrest control of the Tahrir square in rival rallies.
At least 100 people have been injured as protesters showered stones at each other. The clashes started after Brotherhood supporters tore down a podium belonging to a group that was chanting anti-Morsi slogans, witnesses said.
Morsi's supporters, mainly his powerful Muslim Brotherhood movement, had called their rally to denounce this week's acquittals of Mubarak-era officials.
Mubarak supporters, a coalition of liberal and democratic groups, had previously called their own rally to denounce Islamic control over a body drafting the new constitution, and Morsi's performance in office. Pro-western liberals and democrats torched two buses used by the Brotherhood to drive supporters into central Cairo, sending plumes of smoke into the air.