A wall protecting the presidential palace in Cairo
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Egypt crisis: Anti-Morsi protesters attack barricade

Anti-government protesters have tried to tear down a wall protecting the presidential palace in Cairo.

It comes ahead of rival rallies sparked by a referendum on a new constitution ordered by President Mohammed Morsi.

He has called on the army to maintain security and protect state institutions ahead of Saturday's vote.

Go to next video: Crowds gather for Cairo rallies