CAIRO — A crowd of ousted President Mohamed Morsi's supporters is gathered outside the headquarters of the Republican Guard in a tense stand-off with army and police forces.
At least one man was shot dead here this afternoon, although it is unclear as to whether the bullet came from the military or from the police line that is gathered behind them.
While military helicopters circled overhead, tear gas and birdshot were fired on protesters in the chaos that followed. Protesters were clutching posters of the former president, his face daubed with blood from the injured protesters.
Tarek Mohamed Abd el Samiyah, clutching two bloodied pieces of bone that he said came from the dead man's skull, said, "They shot him through the eye, they fired more bullets at the crowd. We did not have a revolution for this."
Reuters and AFP reported that at least three of the president's supporters were shot and killed after armed forces opened fire during clashes with pro-Morsi protesters. By nightfall, Egypt's healthy ministry confirmed that six had died in protests across the country on Friday.
An army spokesperson denied reports that Egyptian troops killed the Morsi supporters, claiming that soldiers at the Cairo rally were using only blank rounds and teargas to control the crowd.
At the protest, Muslim Brotherhood politician Mohamed al-Beltagy addressed the crowd, standing between the president's supporters and the army line.
"We are not here to fight, we are here to get Morsi out," Beltagy said, turning to the army. "We do not have rocks, we are not cursing you, but even if you kill us, we are not leaving until [Morsi] is with us."
Egypt's Muslim Brotherhood had earlier called for a day of protests Friday, two days after the military deposed Morsi and appointed an interim leader in his stead.
Tens of thousands turned out in response, across Egypt. The military has promised that demonstrations will be allowed to proceed, so long as they remain non-violent.
Urging its allies to join it in a day alternately called "Friday of Rejection" and "Friday of Rage," the Brotherhood said it would not cooperate with Egypt's "usurping authorities."
"We declare our complete rejection of the military coup staged against the elected president and the will of the nation," a Brotherhood spokesman told supporters camped outside the the Rabia al-Adawiya Mosque in Cairo, the Associated Press reported.
"We refuse to participate in any activities with the usurping authorities."
More from GlobalPost: The army and the Islamists, Egypt's historical frenemies
"Peaceful protest and freedom of expression are rights guaranteed to everyone, which Egyptians have earned as one of the most important gains of their glorious revolution," the armed forces' commanding council said in a statement on its Facebook page, according to Reuters' translation.
The council warned against "excessive" use of that right, however, which it said would endanger Egypt's security and national interests. A military source told Reuters that troops and possibly air force jets would be deployed Friday to head off clashes between pro- and anti-Morsi demonstrators.
Violence broke out Thursday in Morsi's home town of Zagazig between supporters demanding his reinstatement and opponents backing the military's intervention, Egypt's Ahram Online reported. Some 80 people were injured and 11 arrested for inciting unrest, authorities said.
More from GlobalPost: Rhetoric and reality chart disparate futures for Islamists in Egypt
Morsi supporters and opponents also clashed in Damanhur in northwest Egypt, and Morsi supporters attacked a police station in Giza, wounding one officer, according to MENA.
Meanwhile gunmen attacked army checkpoints, a police station and an airport in the northern Sinai peninsula Friday morning, security sources told the AP. It's not clear whether the attacks were linked to the military take-over, though according to the AP some fear that Islamist extremists will seek to exact revenge for Morsi's overthrow.
One soldier was killed and two were injured in the Sinai attacks, MENA reported.
The African Union suspended Egypt's membership on Friday, saying the country would only be allowed to rejoin once consitutional order has been restored.
Egypt's interim authorities have promised that they will seek only to maintain security, not to punish supporters of the former government or exclude them from whatever comes next. That assurance will be crucial to keeping Western allies — notably the United States — onside, and holding on to valuable foreign aid.While the military said in its Facebook statement that it would not take "any exceptional or arbitrary measures" against any political movement, several senior figures from the Muslim Brotherhood and its Islamist allies have been detained since Wednesday, including Morsi, his closest advisers, and the Brotherhood's powerful "general guide" or supreme leader, Mohamed Badie. More than 200 others are wanted for questioning.
Louisa Loveluck contributed to this report from Cairo.