REPUBLIKA.CO.ID, CAIRO - Egypt's capital descended into chaos Friday as vigilantes at neighborhood checkpoints battled Muslim Brotherhood-led protesters denouncing the ouster of President Mohammed Mursi and a deadly crackdown. The fiercest street clashes Cairo has seen in more than two years of turmoil left at least 82 people dead, including 10 policemen.

Several of the protesters were seen writing their names and relatives' phone numbers on one another's chests and undershirts in case they were to die in Friday's clashes. The sight of residents firing at one another marked a dark turn in the conflict, as civilians armed with pistols and assault rifle clashed with protesters taking part in what the Muslim Brotherhood called a "Day of Rage," ignited by anger at security forces for clearing two sit-in demonstrations Wednesday in clashes that killed more than 600 people.

Unlike in past clashes between protesters and police, residents and possibly police in civilian clothing battled those participating in the Brotherhood-led marches. There were few police in uniform to be seen as neighborhood watchdogs and pro-Morsi protesters fired at one another for hours on a bridge that crosses over Cairo's Zamalek district, an upscale island neighborhood where many foreigners and ambassadors reside.

Armed civilians manned impromptu checkpoints throughout the capital, banning Brotherhood marches from approaching and frisking anyone wanting to pass through. At one checkpoint, residents barred ambulances and cars carrying wounded from Cairo's main battleground, Ramses Square, from reaching a hospital.

The scenes highlighted how dangerous the divisions in Egypt have become. At least nine police stations were attacked Friday, officials said. Egypt's police force was rocked by the country's 2011 uprising that ousted longtime leader Hosni Mubarak from power and has not fully recovered since.

On Thursday, the Interior Ministry said it had authorized the use of deadly force against anyone targeting police and state institutions. But the threat appeared not to intimidate protesters.

Tawfik Dessouki, a Brotherhood supporter, said he was ready to fight for "democracy" and against the military's ouster of Morsi. "I am here for the blood of the people who died. We didn't have a revolution to go back to a police and military state again and to be killed by the state," he said during a march headed toward Ramses Square.

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