6 October 2013 Last updated at 13:30 ET
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The BBC's Jim Muir in Cairo has details of the rival rallies in Egypt
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At least 28 people have been killed and dozens hurt in Egypt in clashes between police and supporters of the deposed Islamist President Mohammed Morsi.
More than 200 members of his Muslim Brotherhood were arrested in Cairo, where 26 of the deaths were reported.
Supporters of Mr Morsi marched in several cities, as the military-backed government feted the 40th anniversary of the 1973 Arab-Israeli war.
Morsi supporters say he was deposed in a military coup in July.
'Critical time'Security forces used tear gas and fired into the air to stop thousands of supporters of Mr Morsi from entering Cairo's Tahrir Square.
In Cairo's upscale Dokki district, a number of protesters were hit by rounds, some by birdshot. They threw rocks at police and soldiers in return, the BBC's Quentin Sommerville in Cairo says.
The street battles raged for hours with small fires burning and black smoke rising in several parts of the capital.
But the military succeeded in keeping the two sides apart, our correspondent says.
The rival protests in Cairo turned into running street battles
More than 200 members of the Muslim Brotherhood have been arrested in connection with the violence, an Egyptian security source told BBC Arabic.
Supporters of the military have been converging on Tahrir Square to mark the 40th anniversary of the 1973 Arab-Israeli war
President Mansour laid a wreath as part of planned commemorations
Egyptian society remains polarised by the military overthrow of Islamist president Mohammed Morsi in July.
Hundreds of people had gathered in Tahrir Square to mark the military anniversary. Jets and Apache helicopters flew overhead in formation, as part of a grand display of military hardware by the government.
The interior ministry earlier warned it would confront any "attempts that may disturb the 6 October celebrations", the Mena state news agency reported.
In a televised address, Prime Minister Hazem Beblawi described it as a "critical time" for the country and urged Egyptians to "stand together, be optimistic about the future".
The health ministry said that in addition to the Cairo deaths, one person was killed in Delga, about 300km (190 miles) south of Cairo, and another in Bani Suef, 80km south of the capital.
Hundreds of Islamist protesters have died in violence since the Egyptian military deposed Mr Morsi in July, 13 months after he was elected as president.
He and other senior Brotherhood figures have been imprisoned and face trial.
The authorities are moving to seize the movement's assets after its activities were banned as part of a crackdown.
However, Brotherhood supporters have continued to take to the streets to protest - albeit in smaller numbers than before.
The BBC's Jim Muir in Cairo has details of the rival rallies in Egypt
Continue reading the main story
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- How popular is the Brotherhood?
- Mubarak profile
- Views on Mubarak's release
At least 28 people have been killed and dozens hurt in Egypt in clashes between police and supporters of the deposed Islamist President Mohammed Morsi.
More than 200 members of his Muslim Brotherhood were arrested in Cairo, where 26 of the deaths were reported.
Supporters of Mr Morsi marched in several cities, as the military-backed government feted the 40th anniversary of the 1973 Arab-Israeli war.
Morsi supporters say he was deposed in a military coup in July.
'Critical time'Security forces used tear gas and fired into the air to stop thousands of supporters of Mr Morsi from entering Cairo's Tahrir Square.
In Cairo's upscale Dokki district, a number of protesters were hit by rounds, some by birdshot. They threw rocks at police and soldiers in return, the BBC's Quentin Sommerville in Cairo says.
The street battles raged for hours with small fires burning and black smoke rising in several parts of the capital.
But the military succeeded in keeping the two sides apart, our correspondent says.
Hundreds of people had gathered in Tahrir Square to mark the military anniversary. Jets and Apache helicopters flew overhead in formation, as part of a grand display of military hardware by the government.
The interior ministry earlier warned it would confront any "attempts that may disturb the 6 October celebrations", the Mena state news agency reported.
In a televised address, Prime Minister Hazem Beblawi described it as a "critical time" for the country and urged Egyptians to "stand together, be optimistic about the future".
The health ministry said that in addition to the Cairo deaths, one person was killed in Delga, about 300km (190 miles) south of Cairo, and another in Bani Suef, 80km south of the capital.
Hundreds of Islamist protesters have died in violence since the Egyptian military deposed Mr Morsi in July, 13 months after he was elected as president.
He and other senior Brotherhood figures have been imprisoned and face trial.
The authorities are moving to seize the movement's assets after its activities were banned as part of a crackdown.
However, Brotherhood supporters have continued to take to the streets to protest - albeit in smaller numbers than before.