But, in a sign of how state and private media have played down any support for Morsi, Egyptian television networks mostly broadcast scenes of empty streets and quiet squares. The Muslim Brotherhood said one demonstrator was killed by police.
After weeks of protests against the coup, the government launched a full-fledged crackdown on August 14, starting with raids on two pro-Morsi sit-ins that left hundreds of civilians dead. Security officials have arrested Muslim Brotherhood members every day since then, including the group's most prominent official still at liberty - Mohamed Beltagi - on Thursday. But the state has released only partial figures of arrests.
Egypt's Ministry of Health stopped publishing a total casualty count from the crackdown on August 17 "because of the huge number of deaths," according to one ministry official, who spoke on the condition of anonymity because he was not authorized to speak to the media. At that point, more than 900 people had been killed in four days, according to the official tally.
When Egyptians are arrested, they typically face a hearing before a prosecutor within 48 hours to learn whether they will be detained pending possible trial, said Diana Eltahawy, an Egypt researcher for Amnesty International. Normally lawyers are allowed access to prosecutors' offices.
But since the coup, the hearings for alleged Morsi supporters "are taking place inside the places of detention - police stations and prisons," as well as in riot police camps, Eltahawy said - and the numbers simply aren't getting out.
Eltahawysaid the number of detained has probably surpassed 1,000.
Another activist, Ahmed Mehrif, who directs a Switzerland-based Arab rights group, put the number closer to 2,000. And a Western diplomat, who spoke on the usual condition of anonymity, said it could range from 3,000 to 8,000, most of them "rank and file" members of the Muslim Brotherhood, or Morsi supporters unaffiliated with the Islamist group.
In cities and towns across Egypt, police have burst into private homes in a dramatic effort to lock up Brotherhood officials. The scenes are reminiscent of the reign of former autocrat Hosni Mubarak, when the Muslim Brotherhood was a banned opposition group. But the current crackdown on Egypt's Islamists is even harsher than in that era.
Rights activists and lawyers say the detainees are also picked up at protest marches, or grabbed by vigilantes operating in neighborhood "popular committees" who hand them to security forces.
One plainclothes police officer explained this week: "If we see someone suspicious, we look at their paperwork." He spoke as he patted down a pedestrian in downtown Cairo, before rifling through the man's wallet. If the "paperwork is normal," the people are allowed to continue on their way, he said. If not, they're taken into custody.
"We make a judgment based on how he looks," the officer said of the men he stops.
Gen. Hani Abdel Latif, the Interior Ministry spokesman, said this week that his forces had arrested 213 Brotherhood leaders since August 14. That total did not include lower-ranking members. The government has also, in recent days, brought charges against some of Egypt's most prominent liberal activists for speaking out against police brutality and military rule.
Egypt's Cabinet is now the only body authorized to issue comprehensive death and injury tolls, health officials said. But it has yet to do so. Cabinet spokespersons did not respond to multiple queries for updated figures.
At the Health Ministry, an adviser to the minister grew agitated this week when pressed for the number of people killed since security forces raided the pro-Morsi protest camps.
"I do not have any numbers at all," said Mohamed Fathallah, after also saying that he had provided the Cabinet with the latest figures on Saturday. "Stop pushing," he said.
In another corner of the ministry, an official quietly voiced his opposition to the government's behavior. "You won't find any cooperation at the Health Ministry," he mumbled, after struggling to dig up numbers. "A failure of a government."
London-based Amnesty International published a tally last week based on morgue reports that put the death toll since Aug. 14 at nearly 1,100 nationwide. The Brotherhood had said more than 2,000 people were killed on Aug. 14 alone.
"The Muslim Brotherhood and supporters of the deposed president tend to inflate numbers quite a lot," said Eltahawy. And on the government side, "there is clearly a desire, especially since the dispersal of the protests, to show that the casualty toll was not that high," she added. "So in terms of getting accurate information, it is extremely difficult."
But the state is more forthcoming about certain figures. In his darkened office at Egypt's Interior Ministry this week, Abdel Latif, the spokesman, sat before a stack of papers that contained up-to-the minute data on police casualties in clashes or revenge attacks.
"Since August 14, there have been 106 martyrs and 915 injured," he said, before breaking the numbers down by "officers," "conscripts" and "recruits."
Local media reported that a police officer and a civilian were shot dead early Friday in an attack on a Cairo police position - the second in three days.
On walls and street signs across Cairo's Nasr City district, former home to the sit-ins, signs of the anti-coup fervor have been swiftly and methodically covered up. Swatches of red and beige paint cover the phrases "Morsi is my president" and "Down with military rule."
Pockets of hundreds of protesters moved through Cairo on Friday, chanting, "revolution, revolution," and holding the four-fingered symbol of their former sit-in outside the Rabaa al-Adawiya mosque. The pro-Morsi Anti-Coup Alliance has claimed in recent days that "tens of millions" of protesters have turned out across the nation, but there has been no evidence of such numbers.
Friday's crowds were small by the standards of this nation's recent protests, and Egyptian security forces had locked down the squares, thoroughfares and even mosques associated with earlier unrest.