CAIRO -- Supporters and opponents of Egyptian leader Mohammed Morsi fought with rocks, firebombs and sticks outside the presidential palace in Cairo Wednesday in large-scale clashes that marked the worst violence of a deepening crisis over the disputed constitution.
At least 211 people were injured in the clashes that were still raging hours after nightfall.
Three of Morsi's aides resigned in protest of his handling of the crisis. With two aides who had quit earlier, now five of his panel of 17 advisers have left their jobs since the problems began.
Mohamed ElBaradei, a leading opposition advocate of reform and democracy, said Morsi's rule was "no different" from that of former President Hosni Mubarak, whose authoritarian regime was toppled in an uprising nearly two years ago.
"In fact, it is perhaps even worse," the Nobel Peace Laureate told a news conference after he accused the president's supporters of a "vicious and deliberate" attack on peaceful demonstrators.
The opposition is demanding Morsi rescind decrees giving him nearly unrestricted powers and shelve a disputed draft constitution that the president's Islamist allies passed hurriedly last week.
The dueling demonstrations and violence are part of a political crisis that has left the country divided into two camps: Islamists versus an opposition made up of youth groups, liberal parties and large sectors of the public. Both sides have dug in their heels, signaling a protracted standoff.
The latest clashes began when thousands of Islamist supporters of Morsi descended on the area around the palace where some 300 of his opponents were staging a sit-in.
The Islamists, members of Morsi's Muslim Brotherhood group, chased the protesters away from their base outside the palace's main gate and tore down their tents.
The protesters scattered in side streets where they chanted anti-Morsi slogans. After a lull in fighting, hundreds of young Morsi opponents arrived at the scene and immediately began throwing firebombs at the president's backers, who responded with rocks.