Tensions continue to mount after an interim leader was sworn in to replace President Mohamed Morsi who was removed by the Egyptian military last night.
The military had been responding to widespread protests calling for Morsi to go, but protests by Morsi supporters have continued and are fuelling fears that there could be further violence.
ITV News International Correspondent John Irvine reports from Cairo:
The head of the Constitutional Court Adli Mansor was sworn in to replace Morsi in a ceremony which saw protests from Morsi supporters.
Adli Mansour has said he is not president for a "fixed term", but only until parliamentary elections and the new constitution has been completed.
He told Channel 4 News' Foreign Affairs Correspondent Jonathan Rugman:
The military had said that Mansour will only retain power until full presidential elections can take place, although no time scale has yet been released.
Ousted President Morsi and a great number of his supporters and those in his Muslim Brotherhood party have been arrested and pro-Morsi TV channels have been taken off air.
The international community has been cautious over the change in governance with David Cameron saying what was most important for Egypt now was for democracy to flourish and for a "genuine democratic transition to take place."
France denounced the moves, with President Francois Hollande says the democratic process in Egypt has stopped and must return.
Tunisia's ruling Islamist party, Ennahda, also condemned what it called a "coup against legitimacy" after the army ousted Egypt's first democratically elected president.
"Ennahda rejects what happened and believes legitimacy is represented by President Mohamed Morsi, and no one else," said a statement from the party, which has headed the Tunisian government since 2011.