CAIRO -- Supporters and opponents of Egyptian President Mohammed Morsi clashed in fierce battles outside the presidential palace Wednesday, pelting each other with rocks, throwing Molotov cocktails and tear gas canisters and chasing one another around the compound in a melee that left five dead and more than 697 people injured.
The mayhem marked a new escalation in a divisive political crisis, over the prospect of a new constitution, that shows no signs of subsiding. The man Morsi appointed two days ago to oversee the Dec. 15 referendum on the document, Zaghloul El-Balshi, reportedly resigned, telling a TV interviewer, I will not participate in a referendum that spilled Egyptian blood.
Both sides of the dispute remain passionate that they represent the spirit of the revolt that led to the toppling of former Egyptian President Hosni Mubarak nearly two years ago. Morsis supporters say that as the nations first democratically elected president, he is trying to rid the government of Mubarak holdovers. Opponents argue that Morsi has grabbed power illicitly and that the Muslim Brotherhood, the group through which Morsi gained prominence, is behaving thuggishly, intimidating judges and private citizens alike.
Those disagreements had been aired relatively peacefully until Wednesday, when partisans set upon one another in the worst violence Egypt has seen since the 2011 anti-Mubarak protests.
Its a clash between two groups who believe they are good guys. Its tragic. If I were the old regime, I would be laughing and saying this is what happens in revolutions, said Noah Feldman, a law professor at Harvard University who has closely tracked Egyptian developments.
Who started the clashes was unclear as each side blamed the other. Even the role of the police was in dispute.
One anti-Morsi activist, Salma Said, said police officers allowed members of the Brotherhood to cross their lines to attack anti-Morsi demonstrators.
Police made no obvious moves to separate the two sides, however, and the tear gas that enveloped the scene apparently originated with the demonstrators themselves.
There was no sign that Morsi was willing to meet opposition demands that he cancel the referendum and withdraw a Nov. 22 decree that declared his decisions above review by the countrys courts.
Mahmoud Mekki, Morsis vice president, called for dialogue but said Morsi would not meet those demands. He said the opposition must forsake its efforts to pressure Morsi with massive street demonstrations, calling such efforts unacceptable.
We have to get rid of this phenomenon of showing force in the street. We should calm down and communicate through constructive dialogue, Mekki said.
Another Morsi adviser put the conflict in warlike terms.
This is the final battle of revolutionaries and counterrevolutionaries, Essam al Aryan, who belongs to the Brotherhood, told al Jazeera English.
Morsis opponents, meanwhile, took steps to bring order to what even they acknowledged had been a movement riven by political rivalries and disorganization. An umbrella group that had struggled to name a leader announced that it had agreed that Mohamed ElBaradei, the former director-general of the International Atomic Energy Agency, would lead the group.
ElBaradei then spoke in dire terms, using the word regime to describe Morsis government.
The legitimacy of the regime is on the verge of collapsing, ElBaradei said.
ElBaradei said one person had been killed, but there was no official confirmation of a death. The Ministry of Health said at least 211 had been injured. Another 32 had been arrested, according to the Interior Ministry.
Morsi remained silent, and it was unknown if he was in the palace during the violence.
In Washington, the Obama administration called for dialogue. White House spokesman Jay Carney said that the administration was looking for the Egyptian government to show restraint and for both sides to refrain from violence.
"We remain concerned with the continuing lack of consensus regarding the recent constitutional declarations and the handling of the draft constitution in Egypt, Carney said.
At NATO, Secretary of State Hillary Clinton told reporters that dialogue is urgently needed.
But the violence Wednesday, the latest in what has become nearly daily protests, made such an outcome less likely. Like Republicans and Democrats during the 2012 election, both sides disagree on facts, making talk of resolution even more difficult.
A day earlier, anti-Morsi protesters massed at the palace, but the Muslim Brotherhoods newspaper on its front page Wednesday showed only a photo of a single demonstrator smashing a car, suggesting that only a few turned out and that those who did were violent. Meanwhile, more liberal papers showed wide shots of thousands gathered at both the palace and at Cairos Tahrir Square, the site of the 2011 uprising.
The Muslim Brotherhoods newspaper called the protesters anarchists, while describing the constitution as a document designed to protect the poor and marginalized. More liberal publications describe the constitution as vague and a threat on basic freedoms.
There was even disagreement on how many judges had said they would help oversee the Dec. 15 referendum. Liberal papers said only 200 judges had volunteered, while the Brotherhood said that thousands had called off a strike and would be on duty for the voting.
In a crisis facts are in short supply, and we are in a crisis. Some of these things are indeterminate, Feldman said. In addition, there is general uncertainty not only about what opponents will do, but what your side will do.
Which side will prevail remains unclear. A poll released Wednesday by the Egyptian Center for Public Opinion Research, conducted Nov. 28-29 of 2,008 Egyptians, found that 30 percent support Morsis constitutional decree; 37 percent oppose it; and 33 percent are undecided.
Special correspondent Amina Ismail in Cairo contributed to this report.