Both pro and anti government forces gathered in Cairo for rallies ahead of a divisive referendum - scheduled to take place on Saturday - on a new constitution that the opposition says is too Islamist.
Egyptian authorities have arrested dozens of suspected Islamists ahead of the opposition's call for nationwide rallies. Meanwhile, gunmen shot dead a senior army officer and wounded two soldiers in the capital Cairo.
Turkish police have moved in to forcibly break up a demonstration in the capital, Ankara. The authorities said the protest, organized by a teachers' union, was illegal.
Egyptian police have arrested one of the last Muslim Brotherhood leaders not already in detention or in exile. Thousands of the group's members have been rounded up in a mass crackdown.
An Egyptian court has acquitted former President Hosni Mubarak of charges connected with the deaths of protesters during a 2011 uprising. His then-interior minister was also cleared of similar charges.
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