Tens of thousands took to the streets in a determined push for the return to power of Egypt's ousted Islamist leader, as the military beefed up security and Mohammed Morsi's opponents staged rival rallies, raising fears of a fresh round of clashes.
In the only reported deadly violence on Friday, angry residents of the delta city of Mansoura clashed with pro-Morsi protesters. Gunshots and birdshots were fired, though it was unclear by whom, security officials said.
A 25-year-old woman and a young girl were killed in the late-night violence, according to the officials. A statement from Mr Morsi's Muslim Brotherhood party said the two killed were supporters of the ousted government and blamed hired thugs for shooting them. The army warned it would not tolerate any violence and sent fighter jets screaming over Cairo and helicopters hovering over the marches.
Publicising their protests for days, on Friday Mr Morsi's supporters vowed would be decisive in their campaign to try to reverse the military coup that removed the country's first democratically-elected president after a year in office, following massive protests against him.
Unlike other demonstrations held in the evening after breaking the day-long Ramadan fast, the pro-Morsi rallies took place throughout the day. Organised by the Muslim Brotherhood party and dubbed "Breaking the Coup", they included marches in Cairo's streets, outside military installations and in other cities, including Alexandria and several Nile Delta provinces.
The rival gatherings came just days after a new interim cabinet was sworn in that includes women, Christians and members of a liberal coalition opposed to Mr Morsi, but no Islamists. The Muslim Brotherhood has refused to take part in talks with the interim leadership.
The country has been deeply polarised since the ousting of long-time autocrat Hosni Mubarak in February 2011, following massive rallies. The divisions only deepened over the July 3 military coup supported by millions who accused Mr Morsi of abusing his power and giving too much influence to his Muslim Brotherhood group.
Friday's rallies coincided with the 10th day of the Muslim fasting month of Ramadan, which Egyptians celebrate as the day their armed forces crossed the Suez Canal in the 1973 war with Israel. The surprise assault led to the return of the Sinai Peninsula, which had been occupied by the Jewish state.
The occasion was a chance for the rival camps to focus on the military, which was instrumental in removing Mr Morsi. At pro-Morsi gatherings, protesters extolled the virtue of the armed forces but drew a distinction with its leadership, which they accused of treason for turning against Mr Morsi. Waving Egyptian flags and pictures of the ousted leader, they chanted slogans against army chief General Abdel-Fatah el-Sissi. "El-Sissi is a traitor!" they shouted. "Morsi is our president!"
Meanwhile, several thousand anti-Morsi protesters gathered in Cairo's Tahrir Square and outside two presidential palaces to celebrate their gains. "The people and the army and the police together against terrorism," declared a banner stung across a stage set up at the presidential palace. Army choppers flying overhead dropped gift coupons and Egyptian flags on the gathering in Tahrir Square and a police choir performed nationalist songs in a party that lasted late into the night.