The pro-democracy protest is the biggest demonstration in Egypt in years. And women are increasingly taking part in the politics of the street. Mike Giglio reports. Plus, full coverage of the Egypt protests.

When 29-year-old Dalia Ziada, a popular Egyptian blogger, took to the streets of Cairo to protest this week, she saw an astonishing sight: In the crowds were university students and mothers with families in tow—a diverse mix of women marching and chanting, and running from the police.

Photos: The Protests in Egypt

During Friday’s mass demonstrations, women also participated, vocally and visibly, in what became a brutal standoff with authorities. ( Police reportedly used tear-gas, rubber-bullets and water-cannon against the protesters.)

“Men and women are standing side-by-side in calling for their rights,” said Ziada in a telephone interview, before the government cut all cell phone connections.

Esraa Abdel Fatah, who also protested in Cairo this week, and who is known as “Facebook Girl” after organizing a nation-wide strike through her page in 2008, had a similar take: “We’re all Egyptians.”

This air of inclusiveness has surrounded Egypt’s upheaval from the start, with protesters highlighting the movement’s “purity” and lack of religious or political agenda beyond democratic reform. Women, who in Cairo are often groped in the streets, report that other demonstrators have been remarkably respectful.

Sara Abu Bakr, a journalist and publisher in Cairo, was surprised by the lack of sexual harassment, for which Egypt is infamous, especially during large public events. “This was supposed to be sexual molestation day, and nothing happened,” she said. Several activists in Cairo reported the same.

On the street and online, “Purity”—be it political or sexual—has become a rallying cry.

“Men and women are standing side-by-side in calling for their rights," says Ziada.

“You don’t see political flags [in the crowds],” said Ahmed Samih, an activist who directs an Internet radio station in Cairo. “You don’t see the Muslim Brotherhood. You see Egyptians. You see the flags of Egyptians all over the place.”

Or as Ziada put it: “All you have is an idea.”

• Stephen Kinzer: Egypt Protests Show U.S. Policy Folly• Bruce Riedel: Don’t Fear Egypt’s BrotherhoodSome observers, however, worried that the government might employ professional rabble-rousers to specifically target women. Whether Friday’s government crackdown took aim at women in particular was hard to assess since the government cut Internet access as well cell phone communication.

But it was clear that the standoff was violent and chaotic.

There were reports that police used water cannon on Nobel Peace Prize winner Mohamed ElBaradei, a pro-democracy leader and President Hosni Mubarak’s top adversary, during Friday’s protests. He had returned to Cairo earlier in the week to demand reform.

The Muslim Brotherhood, which until this week was seen as the only force capable of bringing big numbers to the streets, officially endorsed the demonstration after staying on the sidelines for much of the week.

“No political force is in the position to claim this. It’s coming from the people,” says Wael Khalil, a veteran activist in Cairo. “The Tunisian people stood their ground and defied the brute force together. And I think Egyptians…are out to outdo the Tunisians in taking matters into our own hands.”

Mike Giglio is a reporter at Newsweek.