Egyptian security forces Saturday entered a mosque in Cairo after an exchange of gunfire with barricaded backers of toppled Islamist president Mohammed Morsi, dpa reported.
Live footage on local television stations showed groups of people leaving the mosque in central Cairo's Ramsis Square under protection of police and military troops.
State television said Morsi supporters had scaled the mosque's minaret and fired at security forces surrounding the site, who returned the fire.
Security forces later gained control of the minaret, the broadcaster said. There were no immediate reports about casualties.
Some residents of the area tried to attack the evacuees but were prevented by security troops, a witness said.
Ramsis was one of several areas across Egypt where clashes erupted Friday between security forces and Morsi supporters, leaving 173 dead, health authorities said Saturday.
A son of Mohammed Badie, the fugitive chief of Morsi's Muslim Brotherhood movement, was killed during the fighting in Ramsis, a security source said.
Amar Mohammed Badie, a 38-year-old engineer, died of gunshot wounds Friday and his body was taken to a military hospital, the source said.
Police also arrested the brother of Ayman al-Zawahri, the chief of the al-Qaeda terrorist network, security sources said.
Mohammed al-Zawahri, a jihadist who was released from prison in 2011, was arrested at a security checkpoint in Giza, south of Cairo, they said.
Police said they had also arrested 1,004 people, mainly Brotherhood followers, suspected of involvement in Friday's violence.
In a sign of defiance, the Brotherhood has vowed to hold daily protests through next week against the military-backed government, raising fears of further bloodshed.
About 630 people were killed Wednesday in a security crackdown on two major pro-Morsi demonstrations in Cairo and the ensuing violence in the country.
The government vowed Saturday to deal firmly with what it called "powers of terrorism and sabotage."
Interim Prime Minister Hazem al-Beblawi has legally proposed dissolving the Brotherhood. "The proposal is being studied," a cabinet spokesman said Saturday.
Under emergency rules declared by the government this week, police are allowed to use firearms in self-defence and against demonstrators who attack state buildings.
The army's overthrow of Morsi July 3 after protests by millions of Egyptians demanding he step down, has deeply divided Egypt, which is the Arab world's most populous country.
The clampdown on Islamist protesters has drawn international condemnation, mainly from Europe and the United States. However, the Gulf countries have expressed support for Egypt's interim rulers.