Anti-government protesters in the Egyptian capital, Cairo, gathered outside the presidential palace on Monday night to mark the second anniversary of the fall of former president Hosni Mubarak.
The ABC reports rioting began. Rocks were thrown at the palace and police responded by firing water cannon and teargas from the walls of the compound.
President Mohamed Mursi and the Muslim Brotherhood are accused of hijacking the revolution and seeking to monopolise power.
Riot police later chased the protesters away from the palace.
Earlier, anti-Mursi protesters briefly occupied one of the main bridges across the Nile, disrupting rush-hour traffic.